nLab
Strøm's theorem

Strøm’s theorem

Let (X,A) and (Y,B) be NDR-pairs. Their product in the category of topological pairs

(X×Y,X×BA×Y)(X\times Y,X\times B\cup A\times Y)

is also an NDR-pair.

Revised on December 3, 2009 23:12:57 by Toby Bartels (173.60.119.197)