mathlib3

342bccf6 - refactor(group_theory/solvable): `simp` -> assumption (#6120)

refactor(group_theory/solvable): `simp` -> assumption (#6120) Co-authors: `lean-gptf`, Stanislas Polu This was found by `formal-lean-wm-to-tt-m1-m2-v4-c4` when we evaluated it on theorems added to `mathlib` after we last extracted training data.