Cohomology and extensions of representations of groups with normal Engel subgroups
Abstract Let %$\lambda ,U%$ be representations of a group G with a normal subgroup N. We study the first cohomology group under various spectral type conditions imposed on the restrictions of %$\lambda ,U%$ to N. We assume often that N is an Engel group and examine various decompositions of the exte...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Kissin, Edward [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2023 |
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| Anmerkung: |
© The Author(s), under exclusive licence to Springer Nature Switzerland AG 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law. |
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| Übergeordnetes Werk: |
Enthalten in: European journal of mathematics - Berlin [u.a.] : Springer, 2015, 9(2023), 3 vom: Sept. |
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| Übergeordnetes Werk: |
volume:9 ; year:2023 ; number:3 ; month:09 |
| Links: |
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| DOI / URN: |
10.1007/s40879-023-00661-w |
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| Katalog-ID: |
SPR05302947X |
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| 245 | 1 | 0 | |a Cohomology and extensions of representations of groups with normal Engel subgroups |
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| 520 | |a Abstract Let %$\lambda ,U%$ be representations of a group G with a normal subgroup N. We study the first cohomology group under various spectral type conditions imposed on the restrictions of %$\lambda ,U%$ to N. We assume often that N is an Engel group and examine various decompositions of the extension %$\mathfrak {e}(\lambda ,U,\xi )%$ of %$\lambda %$ by U associated with non-trivial %$(\lambda ,U)%$-cocycles %$\xi %$. Aiming at applications to double extensions and the theory of J-unitary group representations on indefinite metric spaces, we describe (%$\lambda ,U)%$-cocycles when %$G=D\,{\ltimes }\, N%$ is the semidirect product, D is an Engel group and the restrictions of %$\lambda ,U%$ to N are %$\chi \textbf{1}%$ for some character %$\chi %$ on N (such pairs of representations form in a sense a base class in the variety of all pairs of representations). Our description is complete if , where is the group of all diagonal matrices with positive entries, or is the group of all upper triangular matrices %$d=(d_{ij})%$ with %$d_{ii}>0%$ and T is its subgroup of all matrices with %$d_{ii}=1%$, or %$G=\textrm{SO}(2)\,{\ltimes }\, \mathbb {R}^{2}%$. | ||
| 650 | 4 | |a Group representations |7 (dpeaa)DE-He213 | |
| 650 | 4 | |a Extension of representations |7 (dpeaa)DE-He213 | |
| 650 | 4 | |a Cohomology group related to representations |7 (dpeaa)DE-He213 | |
| 650 | 4 | |a Engel groups |7 (dpeaa)DE-He213 | |
| 650 | 4 | |a Normal subgroups |7 (dpeaa)DE-He213 | |
| 650 | 4 | |a Semidirect product of groups |7 (dpeaa)DE-He213 | |
| 700 | 1 | |a Shulman, Victor S. |4 aut | |
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10.1007/s40879-023-00661-w doi (DE-627)SPR05302947X (SPR)s40879-023-00661-w-e DE-627 ger DE-627 rakwb eng Kissin, Edward verfasserin aut Cohomology and extensions of representations of groups with normal Engel subgroups 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law. Abstract Let %$\lambda ,U%$ be representations of a group G with a normal subgroup N. We study the first cohomology group under various spectral type conditions imposed on the restrictions of %$\lambda ,U%$ to N. We assume often that N is an Engel group and examine various decompositions of the extension %$\mathfrak {e}(\lambda ,U,\xi )%$ of %$\lambda %$ by U associated with non-trivial %$(\lambda ,U)%$-cocycles %$\xi %$. Aiming at applications to double extensions and the theory of J-unitary group representations on indefinite metric spaces, we describe (%$\lambda ,U)%$-cocycles when %$G=D\,{\ltimes }\, N%$ is the semidirect product, D is an Engel group and the restrictions of %$\lambda ,U%$ to N are %$\chi \textbf{1}%$ for some character %$\chi %$ on N (such pairs of representations form in a sense a base class in the variety of all pairs of representations). Our description is complete if , where is the group of all diagonal matrices with positive entries, or is the group of all upper triangular matrices %$d=(d_{ij})%$ with %$d_{ii}>0%$ and T is its subgroup of all matrices with %$d_{ii}=1%$, or %$G=\textrm{SO}(2)\,{\ltimes }\, \mathbb {R}^{2}%$. Group representations (dpeaa)DE-He213 Extension of representations (dpeaa)DE-He213 Cohomology group related to representations (dpeaa)DE-He213 Engel groups (dpeaa)DE-He213 Normal subgroups (dpeaa)DE-He213 Semidirect product of groups (dpeaa)DE-He213 Shulman, Victor S. aut Enthalten in European journal of mathematics Berlin [u.a.] : Springer, 2015 9(2023), 3 vom: Sept. (DE-627)815914067 (DE-600)2806605-4 2199-6768 nnns volume:9 year:2023 number:3 month:09 https://dx.doi.org/10.1007/s40879-023-00661-w lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_150 GBV_ILN_151 GBV_ILN_152 GBV_ILN_161 GBV_ILN_170 GBV_ILN_171 GBV_ILN_187 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_636 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2088 GBV_ILN_2093 GBV_ILN_2106 GBV_ILN_2107 GBV_ILN_2108 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2446 GBV_ILN_2470 GBV_ILN_2472 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4246 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4328 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4393 GBV_ILN_4700 AR 9 2023 3 09 |
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10.1007/s40879-023-00661-w doi (DE-627)SPR05302947X (SPR)s40879-023-00661-w-e DE-627 ger DE-627 rakwb eng Kissin, Edward verfasserin aut Cohomology and extensions of representations of groups with normal Engel subgroups 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law. Abstract Let %$\lambda ,U%$ be representations of a group G with a normal subgroup N. We study the first cohomology group under various spectral type conditions imposed on the restrictions of %$\lambda ,U%$ to N. We assume often that N is an Engel group and examine various decompositions of the extension %$\mathfrak {e}(\lambda ,U,\xi )%$ of %$\lambda %$ by U associated with non-trivial %$(\lambda ,U)%$-cocycles %$\xi %$. Aiming at applications to double extensions and the theory of J-unitary group representations on indefinite metric spaces, we describe (%$\lambda ,U)%$-cocycles when %$G=D\,{\ltimes }\, N%$ is the semidirect product, D is an Engel group and the restrictions of %$\lambda ,U%$ to N are %$\chi \textbf{1}%$ for some character %$\chi %$ on N (such pairs of representations form in a sense a base class in the variety of all pairs of representations). Our description is complete if , where is the group of all diagonal matrices with positive entries, or is the group of all upper triangular matrices %$d=(d_{ij})%$ with %$d_{ii}>0%$ and T is its subgroup of all matrices with %$d_{ii}=1%$, or %$G=\textrm{SO}(2)\,{\ltimes }\, \mathbb {R}^{2}%$. Group representations (dpeaa)DE-He213 Extension of representations (dpeaa)DE-He213 Cohomology group related to representations (dpeaa)DE-He213 Engel groups (dpeaa)DE-He213 Normal subgroups (dpeaa)DE-He213 Semidirect product of groups (dpeaa)DE-He213 Shulman, Victor S. aut Enthalten in European journal of mathematics Berlin [u.a.] : Springer, 2015 9(2023), 3 vom: Sept. (DE-627)815914067 (DE-600)2806605-4 2199-6768 nnns volume:9 year:2023 number:3 month:09 https://dx.doi.org/10.1007/s40879-023-00661-w lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_150 GBV_ILN_151 GBV_ILN_152 GBV_ILN_161 GBV_ILN_170 GBV_ILN_171 GBV_ILN_187 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_636 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2088 GBV_ILN_2093 GBV_ILN_2106 GBV_ILN_2107 GBV_ILN_2108 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2446 GBV_ILN_2470 GBV_ILN_2472 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4246 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4328 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4393 GBV_ILN_4700 AR 9 2023 3 09 |
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10.1007/s40879-023-00661-w doi (DE-627)SPR05302947X (SPR)s40879-023-00661-w-e DE-627 ger DE-627 rakwb eng Kissin, Edward verfasserin aut Cohomology and extensions of representations of groups with normal Engel subgroups 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law. Abstract Let %$\lambda ,U%$ be representations of a group G with a normal subgroup N. We study the first cohomology group under various spectral type conditions imposed on the restrictions of %$\lambda ,U%$ to N. We assume often that N is an Engel group and examine various decompositions of the extension %$\mathfrak {e}(\lambda ,U,\xi )%$ of %$\lambda %$ by U associated with non-trivial %$(\lambda ,U)%$-cocycles %$\xi %$. Aiming at applications to double extensions and the theory of J-unitary group representations on indefinite metric spaces, we describe (%$\lambda ,U)%$-cocycles when %$G=D\,{\ltimes }\, N%$ is the semidirect product, D is an Engel group and the restrictions of %$\lambda ,U%$ to N are %$\chi \textbf{1}%$ for some character %$\chi %$ on N (such pairs of representations form in a sense a base class in the variety of all pairs of representations). Our description is complete if , where is the group of all diagonal matrices with positive entries, or is the group of all upper triangular matrices %$d=(d_{ij})%$ with %$d_{ii}>0%$ and T is its subgroup of all matrices with %$d_{ii}=1%$, or %$G=\textrm{SO}(2)\,{\ltimes }\, \mathbb {R}^{2}%$. Group representations (dpeaa)DE-He213 Extension of representations (dpeaa)DE-He213 Cohomology group related to representations (dpeaa)DE-He213 Engel groups (dpeaa)DE-He213 Normal subgroups (dpeaa)DE-He213 Semidirect product of groups (dpeaa)DE-He213 Shulman, Victor S. aut Enthalten in European journal of mathematics Berlin [u.a.] : Springer, 2015 9(2023), 3 vom: Sept. (DE-627)815914067 (DE-600)2806605-4 2199-6768 nnns volume:9 year:2023 number:3 month:09 https://dx.doi.org/10.1007/s40879-023-00661-w lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_150 GBV_ILN_151 GBV_ILN_152 GBV_ILN_161 GBV_ILN_170 GBV_ILN_171 GBV_ILN_187 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_636 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2088 GBV_ILN_2093 GBV_ILN_2106 GBV_ILN_2107 GBV_ILN_2108 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2446 GBV_ILN_2470 GBV_ILN_2472 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4246 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4328 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4393 GBV_ILN_4700 AR 9 2023 3 09 |
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10.1007/s40879-023-00661-w doi (DE-627)SPR05302947X (SPR)s40879-023-00661-w-e DE-627 ger DE-627 rakwb eng Kissin, Edward verfasserin aut Cohomology and extensions of representations of groups with normal Engel subgroups 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law. Abstract Let %$\lambda ,U%$ be representations of a group G with a normal subgroup N. We study the first cohomology group under various spectral type conditions imposed on the restrictions of %$\lambda ,U%$ to N. We assume often that N is an Engel group and examine various decompositions of the extension %$\mathfrak {e}(\lambda ,U,\xi )%$ of %$\lambda %$ by U associated with non-trivial %$(\lambda ,U)%$-cocycles %$\xi %$. Aiming at applications to double extensions and the theory of J-unitary group representations on indefinite metric spaces, we describe (%$\lambda ,U)%$-cocycles when %$G=D\,{\ltimes }\, N%$ is the semidirect product, D is an Engel group and the restrictions of %$\lambda ,U%$ to N are %$\chi \textbf{1}%$ for some character %$\chi %$ on N (such pairs of representations form in a sense a base class in the variety of all pairs of representations). Our description is complete if , where is the group of all diagonal matrices with positive entries, or is the group of all upper triangular matrices %$d=(d_{ij})%$ with %$d_{ii}>0%$ and T is its subgroup of all matrices with %$d_{ii}=1%$, or %$G=\textrm{SO}(2)\,{\ltimes }\, \mathbb {R}^{2}%$. Group representations (dpeaa)DE-He213 Extension of representations (dpeaa)DE-He213 Cohomology group related to representations (dpeaa)DE-He213 Engel groups (dpeaa)DE-He213 Normal subgroups (dpeaa)DE-He213 Semidirect product of groups (dpeaa)DE-He213 Shulman, Victor S. aut Enthalten in European journal of mathematics Berlin [u.a.] : Springer, 2015 9(2023), 3 vom: Sept. (DE-627)815914067 (DE-600)2806605-4 2199-6768 nnns volume:9 year:2023 number:3 month:09 https://dx.doi.org/10.1007/s40879-023-00661-w lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_150 GBV_ILN_151 GBV_ILN_152 GBV_ILN_161 GBV_ILN_170 GBV_ILN_171 GBV_ILN_187 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_636 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2088 GBV_ILN_2093 GBV_ILN_2106 GBV_ILN_2107 GBV_ILN_2108 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2446 GBV_ILN_2470 GBV_ILN_2472 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4246 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4328 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4393 GBV_ILN_4700 AR 9 2023 3 09 |
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10.1007/s40879-023-00661-w doi (DE-627)SPR05302947X (SPR)s40879-023-00661-w-e DE-627 ger DE-627 rakwb eng Kissin, Edward verfasserin aut Cohomology and extensions of representations of groups with normal Engel subgroups 2023 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law. Abstract Let %$\lambda ,U%$ be representations of a group G with a normal subgroup N. We study the first cohomology group under various spectral type conditions imposed on the restrictions of %$\lambda ,U%$ to N. We assume often that N is an Engel group and examine various decompositions of the extension %$\mathfrak {e}(\lambda ,U,\xi )%$ of %$\lambda %$ by U associated with non-trivial %$(\lambda ,U)%$-cocycles %$\xi %$. Aiming at applications to double extensions and the theory of J-unitary group representations on indefinite metric spaces, we describe (%$\lambda ,U)%$-cocycles when %$G=D\,{\ltimes }\, N%$ is the semidirect product, D is an Engel group and the restrictions of %$\lambda ,U%$ to N are %$\chi \textbf{1}%$ for some character %$\chi %$ on N (such pairs of representations form in a sense a base class in the variety of all pairs of representations). Our description is complete if , where is the group of all diagonal matrices with positive entries, or is the group of all upper triangular matrices %$d=(d_{ij})%$ with %$d_{ii}>0%$ and T is its subgroup of all matrices with %$d_{ii}=1%$, or %$G=\textrm{SO}(2)\,{\ltimes }\, \mathbb {R}^{2}%$. Group representations (dpeaa)DE-He213 Extension of representations (dpeaa)DE-He213 Cohomology group related to representations (dpeaa)DE-He213 Engel groups (dpeaa)DE-He213 Normal subgroups (dpeaa)DE-He213 Semidirect product of groups (dpeaa)DE-He213 Shulman, Victor S. aut Enthalten in European journal of mathematics Berlin [u.a.] : Springer, 2015 9(2023), 3 vom: Sept. (DE-627)815914067 (DE-600)2806605-4 2199-6768 nnns volume:9 year:2023 number:3 month:09 https://dx.doi.org/10.1007/s40879-023-00661-w lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_120 GBV_ILN_138 GBV_ILN_150 GBV_ILN_151 GBV_ILN_152 GBV_ILN_161 GBV_ILN_170 GBV_ILN_171 GBV_ILN_187 GBV_ILN_213 GBV_ILN_224 GBV_ILN_230 GBV_ILN_250 GBV_ILN_281 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_636 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2057 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2088 GBV_ILN_2093 GBV_ILN_2106 GBV_ILN_2107 GBV_ILN_2108 GBV_ILN_2110 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2446 GBV_ILN_2470 GBV_ILN_2472 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_2548 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4246 GBV_ILN_4249 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4328 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4393 GBV_ILN_4700 AR 9 2023 3 09 |
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Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.</subfield></datafield><datafield tag="520" ind1=" " ind2=" "><subfield code="a">Abstract Let %$\lambda ,U%$ be representations of a group G with a normal subgroup N. We study the first cohomology group under various spectral type conditions imposed on the restrictions of %$\lambda ,U%$ to N. We assume often that N is an Engel group and examine various decompositions of the extension %$\mathfrak {e}(\lambda ,U,\xi )%$ of %$\lambda %$ by U associated with non-trivial %$(\lambda ,U)%$-cocycles %$\xi %$. Aiming at applications to double extensions and the theory of J-unitary group representations on indefinite metric spaces, we describe (%$\lambda ,U)%$-cocycles when %$G=D\,{\ltimes }\, N%$ is the semidirect product, D is an Engel group and the restrictions of %$\lambda ,U%$ to N are %$\chi \textbf{1}%$ for some character %$\chi %$ on N (such pairs of representations form in a sense a base class in the variety of all pairs of representations). Our description is complete if , where is the group of all diagonal matrices with positive entries, or is the group of all upper triangular matrices %$d=(d_{ij})%$ with %$d_{ii}>0%$ and T is its subgroup of all matrices with %$d_{ii}=1%$, or %$G=\textrm{SO}(2)\,{\ltimes }\, \mathbb {R}^{2}%$.</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Group representations</subfield><subfield code="7">(dpeaa)DE-He213</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Extension of representations</subfield><subfield code="7">(dpeaa)DE-He213</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Cohomology group related to representations</subfield><subfield code="7">(dpeaa)DE-He213</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Engel groups</subfield><subfield code="7">(dpeaa)DE-He213</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Normal 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Kissin, Edward |
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Kissin, Edward misc Group representations misc Extension of representations misc Cohomology group related to representations misc Engel groups misc Normal subgroups misc Semidirect product of groups Cohomology and extensions of representations of groups with normal Engel subgroups |
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Cohomology and extensions of representations of groups with normal Engel subgroups Group representations (dpeaa)DE-He213 Extension of representations (dpeaa)DE-He213 Cohomology group related to representations (dpeaa)DE-He213 Engel groups (dpeaa)DE-He213 Normal subgroups (dpeaa)DE-He213 Semidirect product of groups (dpeaa)DE-He213 |
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misc Group representations misc Extension of representations misc Cohomology group related to representations misc Engel groups misc Normal subgroups misc Semidirect product of groups |
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misc Group representations misc Extension of representations misc Cohomology group related to representations misc Engel groups misc Normal subgroups misc Semidirect product of groups |
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Cohomology and extensions of representations of groups with normal Engel subgroups |
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European journal of mathematics |
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European journal of mathematics |
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Kissin, Edward |
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cohomology and extensions of representations of groups with normal engel subgroups |
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Cohomology and extensions of representations of groups with normal Engel subgroups |
| abstract |
Abstract Let %$\lambda ,U%$ be representations of a group G with a normal subgroup N. We study the first cohomology group under various spectral type conditions imposed on the restrictions of %$\lambda ,U%$ to N. We assume often that N is an Engel group and examine various decompositions of the extension %$\mathfrak {e}(\lambda ,U,\xi )%$ of %$\lambda %$ by U associated with non-trivial %$(\lambda ,U)%$-cocycles %$\xi %$. Aiming at applications to double extensions and the theory of J-unitary group representations on indefinite metric spaces, we describe (%$\lambda ,U)%$-cocycles when %$G=D\,{\ltimes }\, N%$ is the semidirect product, D is an Engel group and the restrictions of %$\lambda ,U%$ to N are %$\chi \textbf{1}%$ for some character %$\chi %$ on N (such pairs of representations form in a sense a base class in the variety of all pairs of representations). Our description is complete if , where is the group of all diagonal matrices with positive entries, or is the group of all upper triangular matrices %$d=(d_{ij})%$ with %$d_{ii}>0%$ and T is its subgroup of all matrices with %$d_{ii}=1%$, or %$G=\textrm{SO}(2)\,{\ltimes }\, \mathbb {R}^{2}%$. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law. |
| abstractGer |
Abstract Let %$\lambda ,U%$ be representations of a group G with a normal subgroup N. We study the first cohomology group under various spectral type conditions imposed on the restrictions of %$\lambda ,U%$ to N. We assume often that N is an Engel group and examine various decompositions of the extension %$\mathfrak {e}(\lambda ,U,\xi )%$ of %$\lambda %$ by U associated with non-trivial %$(\lambda ,U)%$-cocycles %$\xi %$. Aiming at applications to double extensions and the theory of J-unitary group representations on indefinite metric spaces, we describe (%$\lambda ,U)%$-cocycles when %$G=D\,{\ltimes }\, N%$ is the semidirect product, D is an Engel group and the restrictions of %$\lambda ,U%$ to N are %$\chi \textbf{1}%$ for some character %$\chi %$ on N (such pairs of representations form in a sense a base class in the variety of all pairs of representations). Our description is complete if , where is the group of all diagonal matrices with positive entries, or is the group of all upper triangular matrices %$d=(d_{ij})%$ with %$d_{ii}>0%$ and T is its subgroup of all matrices with %$d_{ii}=1%$, or %$G=\textrm{SO}(2)\,{\ltimes }\, \mathbb {R}^{2}%$. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law. |
| abstract_unstemmed |
Abstract Let %$\lambda ,U%$ be representations of a group G with a normal subgroup N. We study the first cohomology group under various spectral type conditions imposed on the restrictions of %$\lambda ,U%$ to N. We assume often that N is an Engel group and examine various decompositions of the extension %$\mathfrak {e}(\lambda ,U,\xi )%$ of %$\lambda %$ by U associated with non-trivial %$(\lambda ,U)%$-cocycles %$\xi %$. Aiming at applications to double extensions and the theory of J-unitary group representations on indefinite metric spaces, we describe (%$\lambda ,U)%$-cocycles when %$G=D\,{\ltimes }\, N%$ is the semidirect product, D is an Engel group and the restrictions of %$\lambda ,U%$ to N are %$\chi \textbf{1}%$ for some character %$\chi %$ on N (such pairs of representations form in a sense a base class in the variety of all pairs of representations). Our description is complete if , where is the group of all diagonal matrices with positive entries, or is the group of all upper triangular matrices %$d=(d_{ij})%$ with %$d_{ii}>0%$ and T is its subgroup of all matrices with %$d_{ii}=1%$, or %$G=\textrm{SO}(2)\,{\ltimes }\, \mathbb {R}^{2}%$. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law. |
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| title_short |
Cohomology and extensions of representations of groups with normal Engel subgroups |
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https://dx.doi.org/10.1007/s40879-023-00661-w |
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Shulman, Victor S. |
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10.1007/s40879-023-00661-w |
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2024-07-03T16:32:55.690Z |
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|
| score |
7.399289 |