Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-01-18 23:02 541688b5

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feat(combinatorics/simple_graph/basic): add lemmas about cardinality of common neighbor set (#5789) Add lemmas about the cardinality of the set of common neighbors between two vertices. Add note in module docstring about naming convention. Part of #5698 in order to prove facts about strongly regular graphs.

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