English
The canonical function basisFun is equal to itself under the definitional equivalence; i.e., the basisFun is consistently identified with itself.
Русский
Канонический базис basisFun совпадает с самим собой under определенной эквивалентности.
LaTeX
$$$\text{basisFun } R η = \text{basisFun } R η$$$
Lean4
@[simp]
theorem basisFun_apply [DecidableEq η] (i) : basisFun R η i = Pi.single i 1 := by
simp only [basisFun, Basis.coe_ofEquivFun, LinearEquiv.refl_symm, LinearEquiv.refl_apply]