mathlib

4a0f332e - feat(data/finset/pointwise): `-s • t = -(s • t)` (#16138)

feat(data/finset/pointwise): `-s • t = -(s • t)` (#16138) and copy over other pointwise `set` lemmas. Generalize the `set` lemmas. `set.smul_neg`, `set.neg_smul`, `set.smul_set_neg`, `set.neg_smul_set` now have explicit arguments.