English
Let i ≠ i'. For any x in M_i, the value of the updated function at i' is 1, i.e. mulSingle i x i' = 1 when i ≠ i'.
Русский
Пусть i ≠ i'. Пусть x ∈ M_i. Значение обновленной функции в индексе i' равно 1, то есть mulSingle i x i' = 1 при i ≠ i'.
LaTeX
$$$\forall {i i' : ι} (h : i' \neq i) (x : M i),\; mulSingle i x i' = 1$$$
Lean4
/-- Abbreviation for `mulSingle_eq_of_ne h.symm`, for ease of use by `simp`. -/
@[to_additive (attr := simp) /-- Abbreviation for `single_eq_of_ne h.symm`, for ease of use by `simp`. -/
]
theorem mulSingle_eq_of_ne' {i i' : ι} (h : i ≠ i') (x : M i) : mulSingle i x i' = 1 :=
mulSingle_eq_of_ne h.symm x