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Commit 2021-03-26 18:26 3566cbba

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feat(*): add more lemmas about set.piecewise (#6862)

Estimated changes

Modified src/algebra/group/pi.lean

added theorem pi.piecewise_div

added theorem pi.piecewise_inv

added theorem set.piecewise_mul

Modified src/data/indicator_function.lean

Modified src/data/set/function.lean

added theorem set.apply_piecewise

added theorem set.apply_piecewise₂

deleted theorem set.comp_piecewise

added theorem set.le_piecewise

added theorem set.piecewise_le

added theorem set.piecewise_le_piecewise

added theorem set.piecewise_op

added theorem set.piecewise_op₂

Modified src/data/set/intervals/pi.lean

added theorem set.piecewise_mem_Icc'

added theorem set.piecewise_mem_Icc