English
If α is a topological space with T1 separation and continuous multiplication, then embedProduct α: α → α × αᵐᵒᵖ is a closed embedding.
Русский
Если α имеет топологическое пространство с T1 и непрерывное умножение, то embedProduct α: α → α × αᵐᵒᵖ является замкнутым вложением.
LaTeX
$$$ IsClosedEmbedding (embedProduct \\alpha) $$$
Lean4
@[to_additive]
theorem isClosedEmbedding_embedProduct [T1Space α] [ContinuousMul α] : IsClosedEmbedding (embedProduct α)
where
toIsEmbedding := isEmbedding_embedProduct
isClosed_range := by
rw [range_embedProduct]
refine .inter (isClosed_singleton.preimage ?_) (isClosed_singleton.preimage ?_) <;> fun_prop