English
There is an isomorphism between the space of families (fi) and the space of monoid homomorphisms CoprodI(M) →* N, given by lift and its inverse of.
Русский
Существует изоморфизм между множествами семей fi и множествами гомоморфизм CoprodI(M) →* N, задаваемый lift и обратной величиной.
LaTeX
$$$\\mathrm{lift}: (\\forall i, M_i \\to* N) \\cong (CoprodI(M) \\to* N).$$$
Lean4
@[simp]
theorem lift_comp_of' {N} [Monoid N] (f : CoprodI M →* N) : lift (fun i ↦ f.comp (of (i := i))) = f :=
lift.apply_symm_apply f