On growth rates of closed permutation classes.
On Hallian digraphs, permanents and transversals
On Hall's condition in transversal theory.
On Hultman numbers.
On M-operators of q-lattices
It is well known that every complete lattice can be considered as a complete lattice of closed sets with respect to appropriate closure operator. The theory of q-lattices as a natural generalization of lattices gives rise to a question whether a similar statement is true in the case of q-lattices. In the paper the so-called M-operators are introduced and it is shown that complete q-lattices are q-lattices of closed sets with respect to M-operators.
On packing densities of permutations.
On permutation polynomials over finite fields.
On permutations generated by infinite binary words.
On permutations involving pairs of twins.
On separating sets of words. I.
On separating sets of words. II.
On separating sets of words. IV.
On separating sets of words. V.
On some analogues of descent numbers and major index for the hyperoctahedral group.
On sums of distinct representatives
On symmetric and antisymmetric balanced binary sequences.
On symmetries and parallelogram spaces.
The notion of a TST-space is introduced and its connection with a parallelogram space is given. The existence of a TST-space is equivalent to the existence of a parallelogram space, which is a new characterization of a parallelogram space. The structure of a TST-space is described in terms of an abelian group.
On the combinatorics of permutations. (Zur Kombinatorik von Permutationen.)
On the diagram of Schröder permutations.
On the discrepancy of coloring finite sets.