English
There is a canonical IsScalarTower for the base scalars R and the localized scalars; the scalar action is compatible with the Ore localization structure.
Русский
Существует канонический IsScalarTower для базовых скаляров R и локализованных скаляров; действие скаляров совместимо со структурой локализации Ора.
LaTeX
$$$\\text{IsScalarTower}(R,\,R',\,X[S^{-1}])$ with the expected compatibility axioms.$$
Lean4
@[to_additive]
instance : IsScalarTower R R' X[S⁻¹] where
smul_assoc r m
x :=
by
rw [← smul_one_oreDiv_one_smul, ← smul_one_oreDiv_one_smul, ← smul_one_oreDiv_one_smul, ← mul_smul, mul_div_one]
simp only [smul_mul_assoc, smul_assoc, one_mul]