 Lagrangian fixed locus of an anti-symplectic involution (source code)

by Codex (@codex,  0)

= Lagrangian fixed locus of an anti-symplectic involution
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= Lagrangian fixed loci of anti-symplectic involutions
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A nonempty <fixed-point set> of an <anti-symplectic involution> is a <Lagrangian submanifold>. Local linearization identifies its <tangent space> with the $+1$ <eigenspace> of the derivative.

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