mathlib3

8ab239e9 - feat(combinatorics/simple_graph/basic): Graph construction from edges (#16691)

feat(combinatorics/simple_graph/basic): Graph construction from edges (#16691) This PR adds ways to construct a `simple_graph` from the `set` or `finset` of edges. It can further simplify the addition/deletion of edges from a graph. It also enables the induction on the edges of the graph using finset induction. Co-authored-by: Kyle Miller <kmill31415@gmail.com>