∀ {n : Type u_1} {R : Type u₂} {inst : DecidableEq n} [inst_1 : DecidableEq n] [inst_2 : CommRing R]
  (t t_1 : Matrix.TransvectionStruct n R),
  t = t_1 → ∀ (a a_1 : n), a = a_1 → ∀ (a_2 a_3 : n), a_2 = a_3 → t.toMatrix a a_2 = t_1.toMatrix a_1 a_3