English
The action of g ∈ G on the G-indexed module is given by left translation on the domain, i.e., toFun(g) = Finsupp.lmapDomain(k,k)(g•·).
Русский
Действие g на модуль с индексами G задаётся как левый перенос по домену: toFun(g) = Finsupp.lmapDomain(k,k)(g•·).
LaTeX
$$$\\text{toFun}(g) = \\mathrm{Finsupp.lmapDomain}_{k,k}(g \\cdot \\cdot)$$$
Lean4
/-- The natural `k`-linear `G`-representation on `k[Gⁿ]` induced by left multiplication in `G`. -/
noncomputable abbrev diagonal (n : ℕ) :=
ofMulAction k G (Fin n → G)