Remarques sur la théorie des régions et des aspects
Restricted 123-involutions.
Restricted permutations and Chebyshev polynomials.
Restricted permutations, continued fractions, and Chebyshev polynomials.
Restricted permutations, Fibonacci numbers, and -generalized Fibonacci numbers.
Restricted permutations from Catalan to Fine and back.
Rook theory, generalized Stirling numbers and -analogues.
R-S correspondence for and Klein-4 diagram algebras.
Self-complementary hypergraphs
A k-uniform hypergraph H = (V;E) is called self-complementary if there is a permutation σ:V → V, called self-complementing, such that for every k-subset e of V, e ∈ E if and only if σ(e) ∉ E. In other words, H is isomorphic with . In the present paper, for every k, (1 ≤ k ≤ n), we give a characterization of self-complementig permutations of k-uniform self-complementary hypergraphs of the order n. This characterization implies the well known results for self-complementing permutations of graphs,...
Sequence enumeration.
Set theoretical analogues of two combinatorial theorems
Shadows of colored complexes.
Shape-Wilf-ordering on permutations of length 3.
Signed words and permutations. II: The Euler-Mahonian polynomials.
Signed words and permutations. III: The MacMahon Verfahren.
Solitaire clobber as an optimization problem on words.
Some Considerations of Fibonacci Permutations
Some equidistributed statistics on Genocchi permutations.
Some equinumerous pattern-avoiding classes of permutations.
Some properties of a certain nonaveraging sequence.