## On $$\Sigma$$-products.(English. Russian original)Zbl 0296.54008

Sov. Math., Dokl. 14, 1780-1783 (1973); translation from Dokl. Akad. Nauk SSSR 213, 774-776 (1973).

### MSC:

 54B99 Basic constructions in general topology 54D15 Higher separation axioms (completely regular, normal, perfectly or collectionwise normal, etc.)