∀ (n : Type u_3) (R : Type u_5) (A : Type u_7) [inst : CommSemiring R] [inst_1 : Semiring A] [inst_2 : Algebra R A]
  [inst_3 : DecidableEq n] [inst_4 : Fintype n] (M N : Matrix n n A),
  MatrixEquivTensor.invFun n R A (M + N) = MatrixEquivTensor.invFun n R A M + MatrixEquivTensor.invFun n R A N