mathlib

7e8e174b - style(combinatorics/simple_graph/basic): edit proof of lemma to match style guidelines (#5245)

style(combinatorics/simple_graph/basic): edit proof of lemma to match style guidelines (#5245) Rewrite proof of `adj_iff_exists_edge` to match style guidelines. Co-authored-by: agusakov <39916842+agusakov@users.noreply.github.com>