On properties of fuzzy left -ideals in hemirings with -norms.
On pseudocompactness and related notions in ZF
We study in ZF and in the class of spaces the web of implications/ non-implications between the notions of pseudocompactness, light compactness, countable compactness and some of their ZFC equivalents.
On rectangles and countably generated families
On reflection of stationary sets
We show that there are stationary subsets of uncountable spaces which do not reflect.
On regularity classes of binary relations
On relations
On representation of ternary structures
On Reproductive Solutions Of Arbitrary Equations
On reproductive solutions of arbitrary equations.
On reverses of some binary operators
The notion of reverse of any binary operation on the unit interval is introduced. The properties of reverses of some binary operations are studied and some applications of reverses are indicated.
On rigid relation principles in set theory without the axiom of choice
We study the deductive strength of the following statements: 𝖱𝖱: every set has a rigid binary relation, 𝖧𝖱𝖱: every set has a hereditarily rigid binary relation, 𝖲𝖱𝖱: every set has a strongly rigid binary relation, in set theory without the Axiom of Choice. 𝖱𝖱 was recently formulated by J. D. Hamkins and J. Palumbo, and 𝖲𝖱𝖱 is a classical (non-trivial) 𝖹𝖥𝖢-result by P. Vopěnka, A. Pultr and Z. Hedrlín.
On saturated almost disjoint families
On saturated ideals and
On saturated sets of Boolean rings and Ulam's problem on sets measures
On saturated sets of ideals and Ulam's problem
On saturating ultrafilters on N
On Scheepers' conjecture
On sensible fuzzy ideals of BCK-algebras with respect to a t-conorm.
On sentences provable in impredicative extensions of theories [Book]
On separation properties for families of probability measures.