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Restore geometric Kneser graph isomorphisms - #178
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isoGeometricKneserGraphVerticesandisoGeometricKneserGraphinFormalBook/Chapter_43.lean, replacing bothsorryplaceholders.The proofs reuse existing Mathlib equivalences to label points by
Fin P.cardand useFinset.disjoint_mapto show that adjacency is preserved, establishing the graph isomorphism.