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Commit 2019-07-04 08:45 6493bb6e

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feat(data/list/basic): nodup_update_nth, mem_diff_iff_of_nodup (#1170)

Estimated changes

Modified src/data/list/basic.lean

added theorem list.diff_eq_filter_of_nodup

added theorem list.mem_diff_iff_of_nodup

added theorem list.mem_or_eq_of_mem_update_nth

added theorem list.nodup_update_nth