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Commit 2022-01-08 23:10 22ff4ebc

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feat(combinatorics/simple_graph/matchings): even_card_vertices_of_perfect_matching (#11083)

Estimated changes

Modified src/combinatorics/simple_graph/matching.lean

added theorem simple_graph.subgraph.is_matching.even_card

added theorem simple_graph.subgraph.is_matching.to_edge.surjective

added theorem simple_graph.subgraph.is_matching.to_edge_eq_of_adj

added theorem simple_graph.subgraph.is_matching.to_edge_eq_to_edge_of_adj

added theorem simple_graph.subgraph.is_perfect_matching.even_card

added theorem simple_graph.subgraph.is_perfect_matching_iff_forall_degree

Modified src/combinatorics/simple_graph/subgraph.lean

added theorem simple_graph.subgraph.adj.of_spanning_coe

added theorem simple_graph.subgraph.degree_spanning_coe

added theorem simple_graph.subgraph.is_spanning.card_verts

added theorem simple_graph.subgraph.neighbor_set_subset_verts

deleted theorem simple_graph.subgraph.spanning_coe_adj_sub