English
The function h.basis, when coerced to a function, equals the original index map e; i.e., ⇑h.basis = e.
Русский
Преобразование h.basis в функцию даёт исходное отображение e; то есть ⇑h.basis = e.
LaTeX
$$$ \\text{coe}_\\text{basis} : (h.basis) = e $$$
Lean4
/-- `(h : DualBases e ε).basis` shows the family of vectors `e` forms a basis. -/
@[simps repr_apply, simps -isSimp repr_symm_apply]
def basis : Basis ι R M :=
Basis.ofRepr
{ toFun := coeffs h
invFun := lc e
left_inv := lc_coeffs h
right_inv := coeffs_lc h
map_add' := fun v w => by
ext i
exact (ε i).map_add v w
map_smul' := fun c v => by
ext i
exact (ε i).map_smul c v }