∀ (𝕜 : Type u_2) {α : Type u_5} [inst : AddCommGroup 𝕜] [inst_1 : One 𝕜] [inst_2 : Preorder α]
  [inst_3 : LocallyFiniteOrder α] {inst_4 : DecidableEq α} [inst_5 : DecidableEq α] (b b_1 : α),
  b = b_1 → ∀ (a a_1 : α), a = a_1 → IncidenceAlgebra.muFun'✝ 𝕜 b a = IncidenceAlgebra.muFun'✝ 𝕜 b_1 a_1