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Commit 2020-12-19 14:59 ff830d7e

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feat(ring_theory/witt_vector): redefine subtraction using witt_sub polynomial (#5405)

Estimated changes

Modified src/ring_theory/witt_vector/basic.lean

added theorem witt_vector.map_fun.sub

Modified src/ring_theory/witt_vector/defs.lean

added theorem witt_vector.sub_coeff

added theorem witt_vector.witt_sub_vars

Modified src/ring_theory/witt_vector/is_poly.lean

deleted theorem witt_vector.sub_coeff

deleted theorem witt_vector.sub_eq