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Commit 2020-08-24 23:25 d4d33dea

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feat(combinatorics): define simple graphs (#3458) adds basic definition of simple_graphs

Estimated changes

added theorem sym2.elems_iff_eq
modified theorem sym2.mem_iff
added theorem sym2.mk_has_mem_right
modified inductive sym2.rel
added def sym2.rel_bool
added theorem sym2.rel_bool_spec
modified def sym2