Nowhere dense subsets and Booth's Lemma
The following statement is proved to be independent from : Let be a Tychonoff space with and . Then a union of less than of nowhere dense subsets of is a union of not greater than of nowhere dense subsets.
N-topo nilpotency in fuzzy neighborhood rings.
O riešení niektorých nerozhodnutelných topologických problémov
Observations on spaces with zeroset or regular -diagonals
We show that if has countable extent and has a zeroset diagonal then is submetrizable. We also make a couple of observations regarding spaces with a regular -diagonal.
Omitting cardinals in tame spaces
On 3-topological version of -regularity.
On a cardinal invariant resembling the Souslin number
On a certain lattice of topologies on a product of metric spaces
On a condition for the pseudo radiality of a product
A sufficient condition for the pseudo radiality of the product of two compact Hausdorff spaces is given.
On a construct of closure spaces
On a fuzzy topological structure
On a problem of Sikorski
On a product of metric spaces
On a property of the one-dimensional torus
On a question of Josef Novák about convergence spaces
On a Question of Ljubiša Kočinac
On a tensor product in initially structured categories
On a theorem of Jones and Heath concerning separable normal spaces
On a theorem of M. Katětov
On a theorem of Šapirovskiĭ on the size of a sequential space.