DM
2006
13 years 11 months ago
2006
DM
2006
13 years 11 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 11 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 11 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 11 months ago
2006
DM
2006
13 years 11 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 11 months ago
2006
A skew partition as defined by Chv
DM
2006
13 years 11 months ago
2006
DM
2006
13 years 11 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 11 months ago
2006
A sparse anti-magic square is an n