Geodesic
A remark on the tightness of products
Commentationes Mathematicae Universitatis Carolinae, Tome 37 (1996) no. 2, pp. 397-399.

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We observe the existence of a $\sigma$-compact, separable topological group $G$ and a countable topological group $H$ such that the tightness of $G$ is countable, but the tightness of $G\times H$ is equal to $\frak c$.
Classification : 54A25, 54B10
Keywords: tightness; products; function spaces 
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     title = {A remark on the tightness of products},
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Okunev, Oleg. A remark on the tightness of products. Commentationes Mathematicae Universitatis Carolinae, Tome 37 (1996) no. 2, pp. 397-399. http://geodesic.mathdoc.fr/item/CMUC_1996__37_2_a16/