feat(ring_theory/derivation): The kernel of the map `S ⊗[R] S →ₐ[R] S`. (#15856)
feat(ring_theory/derivation): The kernel of the map `S ⊗[R] S →ₐ[R] S`. (#15856)



Co-authored-by: Andrew Yang <5a6b17dbbc661dec6b250b080ab0033de7d56af5@users.noreply.github.com>

leanprover-community/mathlib,leanprover-community/mathlib