Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2020-07-17 13:47 89996255

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chore(*): more import reduction (#3421) Another import reduction PR. (This is by hand, not just removing transitive imports.) Mostly this one is from staring at leanproject import-graph --to data.polynomial.basic and wondering about weird edges in the graph.

Estimated changes

deleted theorem rat.exists_mul_self
deleted def rat.sqrt
deleted theorem rat.sqrt_eq
deleted theorem rat.sqrt_nonneg
added theorem rat.exists_mul_self
added def rat.sqrt
added theorem rat.sqrt_eq
added theorem rat.sqrt_nonneg