DM
2006
13 years 4 months ago
2006
DM
2006
13 years 4 months ago
2006
We provide a new algorithm for indefinite nested summation which is applicable to summands involving unspecified sequences x(n). More than that, we show how to extend Karr's ...
DM
2006
13 years 4 months ago
2006
The method of partitionable sets for constructing large sets of t-designs have now been used for nearly a decade. The method has resulted in some powerful recursive constructions ...
DM
2006
13 years 4 months ago
2006
For an integer r > 0, a conditional (k, r)-coloring of a graph G is a proper k-coloring of the vertices of G such that every vertex of degree at least r in G will be adjacent t...
DM
2006
13 years 4 months ago
2006
DM
2006
13 years 4 months ago
2006
This paper shows that the number of sign patterns of totally non-zero symmetric n-by-n matrices, up to conjugation by monomial matrices and negation, is equal to the number of unl...
DM
2006
13 years 4 months ago
2006
A skew partition as defined by Chv
DM
2006
13 years 4 months ago
2006
DM
2006
13 years 4 months ago
2006
By a very simple argument, we prove that if l, m, n {0, 1, 2, . . . } then l k=0 (-1)m-k l k m - k n 2k k - 2l + m = l k=0 l k 2k n n - l m + n - 3k - l . On the basis of this ide...
DM
2006
13 years 4 months ago
2006
A sparse anti-magic square is an n