mathlib3

7fff35f5 - chore(algebra/pointwise): remove `@[simp]` from `singleton_one`/`singleton_zero` (#4592)

chore(algebra/pointwise): remove `@[simp]` from `singleton_one`/`singleton_zero` (#4592) This lemma simplified `{1}` and `{0}` to `1` and `0` making them unusable for other `singleton` lemmas.