English
The ith canonical injection from A_i into the free product is the composition of the i-th direct-sum injection with the injection into the quotient.
Русский
i-й канонический инъекция из A_i в свободное произведение есть композиция инъекции прямой суммы и модуля внутри фактор-пространства.
LaTeX
$$$\mathrm{lof}_{R,A}(i) = ι'_{R,A} \circ_{\mathrm{Lin}} \mathrm{DirectSum.lof}_{R,I,A}(i)$$$
Lean4
/-- The `i`th canonical injection, from `A i` to the free product, as
a linear map -/
abbrev lof (i : I) : A i →ₗ[R] FreeProduct R A :=
ι' R A ∘ₗ DirectSum.lof R I A i