List questions from exceptional-isomorphisms

Published on 06 May 2026 - 6:40

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Questions on Isomorphisims

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612

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The "fake $\mathrm{GL}_2(\mathbb{F}_3)$" and the binary octahedral group

Published on 25 Mar 2026 - 3:22

69

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An explicit isomorphism between $\mathbb{R}^+ \times {\rm Spin}^c(3,1)$ and ${\rm GL}^+(2,\mathbb{R})\times {\rm GL}^+(2,\mathbb{R})$?

Published on 07 May 2026 - 13:05

28

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Linear algebraic interpretation of exceptional normal subgroup of $\mathrm{GL}_2(K)$

Published on 25 Mar 2026 - 3:20

576

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Group homomorphism from $SL_2 (\mathbb Z / 5 \mathbb Z)$ to $S_5$

Published on 25 Mar 2026 - 3:20

805

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$SL_2(\mathbb Z_3)/Z(SL_2(\mathbb Z_3)) \cong A_4$

Published on 25 Mar 2026 - 3:19

245

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Is SU(2) a subgroup of the exceptional lie group $G_2$?

Published on 25 Mar 2026 - 3:24

658

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The last accidental spin groups

Published on 17 Apr 2026 - 11:17

496

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Projectivization and stereographic projection, or: Why nonlinear + nonlinear = linear?

Published on 25 Apr 2026 - 14:27

333

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Find an isomorphism $PGL_2(F_3) \cong S_4$

Published on 10 May 2016 - 18:57

85

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How can I prove that $PSL(2,3)\simeq A_4$?

Published on 02 Apr 2026 - 21:42

1.5k

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Binary tetrahedral group and $\rm{SL}_2(\mathbb F_3)$

Published on 25 Mar 2026 - 3:18

1.5k

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Why is $PGL_2(5)\cong S_5$?

Published on 22 Apr 2026 - 15:25

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Examples of non-obvious isomorphisms following from the first isomorphism theorem

Published on 25 Mar 2026 - 3:20

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Spin(4,1) = Sp(1,1) isomorphism

Questions on Isomorphisims

The "fake $\mathrm{GL}_2(\mathbb{F}_3)$" and the binary octahedral group

An explicit isomorphism between $\mathbb{R}^+ \times {\rm Spin}^c(3,1)$ and ${\rm GL}^+(2,\mathbb{R})\times {\rm GL}^+(2,\mathbb{R})$?

Linear algebraic interpretation of exceptional normal subgroup of $\mathrm{GL}_2(K)$

Group homomorphism from $SL_2 (\mathbb Z / 5 \mathbb Z)$ to $S_5$

$SL_2(\mathbb Z_3)/Z(SL_2(\mathbb Z_3)) \cong A_4$

Is SU(2) a subgroup of the exceptional lie group $G_2$?

The last accidental spin groups

Projectivization and stereographic projection, or: Why nonlinear + nonlinear = linear?

Find an isomorphism $PGL_2(F_3) \cong S_4$

How can I prove that $PSL(2,3)\simeq A_4$?

Binary tetrahedral group and $\rm{SL}_2(\mathbb F_3)$

Why is $PGL_2(5)\cong S_5$?

Examples of non-obvious isomorphisms following from the first isomorphism theorem

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