English
If f and g are embeddings, then the product map prod.map f g is an embedding.
Русский
Если f и g являются вложениями, то произведение prod.map f g — вложение.
LaTeX
$$$\\text{IsEmbedding}(\\mathrm{Limits.prod.map} f g)$$$
Lean4
theorem isEmbedding_prodMap {W X Y Z : TopCat.{u}} {f : W ⟶ X} {g : Y ⟶ Z} (hf : IsEmbedding f) (hg : IsEmbedding g) :
IsEmbedding (Limits.prod.map f g) :=
⟨isInducing_prodMap hf.isInducing hg.isInducing,
by
haveI := (TopCat.mono_iff_injective _).mpr hf.injective
haveI := (TopCat.mono_iff_injective _).mpr hg.injective
exact (TopCat.mono_iff_injective _).mp inferInstance⟩