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5“...We give several different q analogues of the following two congruences of Z.W. Sun: k = 0 ( p r 1 ) / 2 1 8 k ( 2 k k ) ( 2 p r ) ( mod p 2 ) and k = 0 ( p r...”

6by Lu, Jiakuan Meng, Wei Moretó, Alexander Wu, Kaisun Published in Czechoslovak mathematical journal (19.03.2021)“...We show that if the average number of (nonnormal) Sylow subgroups of a finite group is less than 29 4 then G is solvable or G/F ( G ) ≌ A 5 . This generalizes...”

7by Bichr, Taher Published in Czechoslovak mathematical journal (01.12.2021)“...Keywords: differential operator; density; equivariant quantization and orthosymplectic algebra Let be the space of linear differential operators on weighted...”

8by Srichan, Teerapat Published in Czechoslovak mathematical journal (26.03.2021)“...A natural number n is said to be a ( k, r )integer if n = a k b , where k > r > 1 and b is not divisible by the r th power of any prime. We study the...”

9by Karlovich, Alexei Shargorodsky, Eugene Published in Czechoslovak mathematical journal (25.06.2021)“...We show that for every p ∈ (1, ∞) there exists a weight w such that the Lorentz Gamma space Γ p,w is reflexive, its lower Boyd and Zippin indices are equal to...”

10by Zhang, Yingying Published in Czechoslovak mathematical journal (01.12.2021)“...Keywords: support Ïtilting module; endomorphism algebra; derived dimension Comparing the bounded derived categories of an algebra and of the endomorphism...”

11“...Let μ be a finite positive measure on the unit disk and let j ⩾ 1 be an integer. D. Suárez (2015) gave some conditions for a generalized Toeplitz operator to...”

12“...In spectral bisection, a Fielder vector is used for partitioning a graph into two connected subgraphs according to its sign pattern. We investigate graphs...”

13“...We combine the techniques of sequence spaces and general Orlicz functions that are broader than the classical cases of N functions. We give three criteria for...”

14by Xu, Baogen Sun, Wanting Li, Shuchao Li, Chunhua Published in Czechoslovak mathematical journal (11.10.2021)“...Let G = ( V G , E G ) be a graph and let N G [ υ ] denote the closed neighbourhood of a vertex υ in G . A function f : V G ⟶ {−1,0,1} is said to be a balanced...”

15by Bouhali, Aissa Bendaoud, Zohra Louhichi, Issam Published in Czechoslovak mathematical journal (30.06.2021)“...We present sufficient conditions for the existence of p th powers of a quasihomogeneous Toeplitz operator T e i sθ φ , where φ is a radial polynomial function...”

16by Agnihotri, Rishabh Chakraborty, Kalyan Published in Czechoslovak mathematical journal (23.04.2021)“...We examine an arithmetical function defined by recursion relations on the sequence { f ( p k )} k ∈ℕ and obtain sufficient condition(s) for the sequence to...”

17by Elma, Ertan Published in Czechoslovak mathematical journal (02.02.2021)“...Let χ be a nonprincipal Dirichlet character modulo a prime number p ≽ 3 and let a X : = 1 2 ( 1 − X ( − 1 ) ) . Define the mean value ℳ p ( − s , X ) : = 2 p −...”

18by Patkowski, Alexander E Published in Czechoslovak mathematical journal (30.06.2021)“...We consider an asymptotic analysis for series related to the work of Hardy and Littlewood (1923) on Diophantine approximation, as well as Davenport. In...”

19“...Keywords: basic hypergeometric series; Watson's transformation; qcongruence; supercongruence; creative microscoping Let denote the nth cyclotomic polynomial...”

20“...We give a graph theoretic interpretation of r Lah numbers, namely, we show that the r Lah number ⌊ n k ⌋ r counting the number of r partitions of an ( n + r...”