Abstract:We present several results related to $L\Sigma (\kappa )$-spaces where $\kappa $ is a finite cardinal or $\omega $; we consider products and some constructions that lead from spaces of these classes to other spaces of similar classes.
Keywords: upper semicontinuous mappings, products, Lindel\"of $\Sigma $-spaces
AMS Subject Classification: 54D20, 54C60, 54B10