English
Reindexing a basis by an equivalence e: ι ≃ ι' yields a basis indexed by ι' with representation b.reindex e = repr_b.trans(domLCongr e).
Русский
Перебиндировка базиса по эквиварианту e: ι → ι' образует базис с представлением b.repr.trans(domLCongr e).
LaTeX
$$$b.reindex e = \mathrm{ofRepr}(b.repr \circ (\mathrm{domLCongr}\ e))$$$
Lean4
/-- `b.reindex (e : ι ≃ ι')` is a basis indexed by `ι'` -/
def reindex : Basis ι' R M :=
.ofRepr (b.repr.trans (Finsupp.domLCongr e))