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Centralizer of $U(n)$ inside $U(nm)$

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#group-theory #lie-groups #classical-groups
305
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Integer Cech cohomology of $SU(3)$

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#lie-groups #homology-cohomology #fibration #classical-groups
81
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Classical groups - applications?

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#soft-question #classical-groups
36
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Why must these have integer coefficients?

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#lie-groups #lie-algebras #classical-groups #cartan-geometry
242
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A description of the compact symplectic group

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#linear-algebra #matrices #symplectic-linear-algebra #classical-groups
45
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Kernel of ${\rm GL}(n,F)$ on ${\rm PG}(n-1,F)$ over a division ring $F$

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#group-theory #projective-geometry #projective-space #classical-groups
459
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Notions of Fundamental Groups for semisimple algebraic groups

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#algebraic-geometry #algebraic-groups #fundamental-groups #root-systems #classical-groups
229
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Hall subgroups of $\mathrm{PSL}$

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#abstract-algebra #group-theory #finite-groups #simple-groups #classical-groups
48
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How to determine if two algebra automorphisms of $M_n(\mathbb{R})$ are similar?

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#algebras #clifford-algebras #classical-groups
525
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Discovering $\pi_1(SO(3))$

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#algebraic-topology #lie-groups #classical-groups
117
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Does $\text{SU}(1,1)$ act transitively on $\mathbb S^1=\{z\in\mathbb C\mid |z|=1\}$?

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#abstract-algebra #group-theory #classical-groups
93
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Sylow subgroup of a subgroup 5

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#abstract-algebra #group-theory #finite-groups #finite-fields #classical-groups
68
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Reference request: structure of stabilisers of totally isotropic subspaces in orthogonal (and unitary) groups

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#group-theory #reference-request #lie-groups #orthogonality #classical-groups
190
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Transitivity of $\Omega$ in subspace actions

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#group-theory #finite-groups #permutations #simple-groups #classical-groups
219
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Is $PGL(n,\Bbb{R}) \cong SL(n+1, \Bbb{R})$ for even n?

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#group-theory #lie-groups #group-isomorphism #projective-space #classical-groups

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