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Some remarks on strong sequences

Jureczko J.

Scientific Issues of Jan Długosz University in Częstochowa. Mathematics

2018

Vol. 23

25--34

Strong sequences were introduced by Efimov in the 60s’ of the last century as a useful method for proving well known theorems on dyadic spaces i.e. continuous images of the Cantor cube. The aim of this paper is to show relations between the cardinal invariant associated with strong sequences and well known invariants of the continuum.

Cardinal invariants concerning closed graph functions

Kosman J.

Demonstratio Mathematica

2012

Vol. 45, nr 4

813-819

Cardinal invariants connected with sums, products and quotients of real functions concerning the family of closed graph functions and the complement in (…) of this family are investigate.