English
The product of two topological groups G × H is itself a topological group, with the product topology and with continuous multiplication and inversion defined componentwise.
Русский
Произведение двух топологических групп G × H itself является топологической группой, операции умножения и инверсии непрерывны по компонентам.
LaTeX
$$$IsTopologicalGroup(G \times H)$$$
Lean4
@[to_additive]
instance instIsTopologicalGroup [TopologicalSpace H] [Group H] [IsTopologicalGroup H] : IsTopologicalGroup (G × H) where
continuous_inv := continuous_inv.prodMap continuous_inv