Combinatorics, group theory and geometric models
Catalan-Zahlen und Wege in einem ganzzahligen Gitter.
Two Remarkable Families of Equilateral Triangles within the Pascal Hexagon - A Triumph for Symmetry
Symmetry In Theory - Mathematics and Aesthetics
Symmetry in Practice - Recreational Constructions
On the Geometry and Combinatorics of the Array of Multinomial Coefficients
On the basic character of residue classes.
Let t, b be mutually prime positive integers. We say that the residue class t mod b is basic if there exists n such that t ≡ -1 mod b; otherwise t is not basic. In this paper we relate the basic character of t mod b to the quadratic character of t modulo the prime factors of b. If all prime factors p of b satisfy p ≡ 3 mod 4, then t is basic mod b if t is a quadratic non-residue mod p for all such p; and t is not basic mod b if t is a quadratic residue mod p for all such p. If, for all prime factors...
On the complementary factor in a new congruence algorithm.
The general quasi-order algorithm in number theory.
On exceptional systems of random integers.
On partitions, surjections, and Stirling numbers.
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