Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-10-31 23:00 60cb2cfe

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feat(data/list): length_filter_lt_length_iff_exists (#10074) Also moved a lemma about filter_map that was placed in the wrong file

Estimated changes

Modified src/data/list/basic.lean

added theorem list.filter_map_cons

added theorem list.length_eq_countp_add_countp

added theorem list.length_filter_lt_length_iff_exists

Modified src/data/list/forall2.lean

deleted theorem list.filter_map_cons