EJC
2010
14 years 11 months ago
2010
EJC
2010
14 years 11 months ago
2010
We use group theory to construct infinite families of maps on surfaces which are invariant under Wilson's map operations of order 3 but not under the operations of order 2, s...
EJC
2010
14 years 11 months ago
2010
In [11] all locally subquadrangular hyperplanes of finite symplectic and Hermitian dual polar spaces were determined with the aid of counting arguments and divisibility properties...
EJC
2010
14 years 11 months ago
2010
EJC
2010
14 years 11 months ago
2010
Abstract. Motivated by juggling sequences and bubble sort, we examine permutations on the set {1, 2, . . . , n} with d descents and maximum drop size k. We give explicit formulas f...
EJC
2010
14 years 11 months ago
2010
EJC
2010
14 years 11 months ago
2010
Let S be a connected graph which contains an induced path of n-1 vertices, where n is the order of S. We consider a puzzle on S. A configuration of the puzzle is simply an n-dimen...
EJC
2010
14 years 11 months ago
2010
In a recent paper, Amini et al. introduced a general framework to prove duality theorems between tree decompositions and their dual combinatorial object. They unify all known ad-h...
65
Voted
EJC
2010
14 years 11 months ago
2010
A graph is k-linked (k-edge-linked), k 1, if for each k pairs of vertices x1, y1,
EJC
2010
14 years 11 months ago
2010
A conjecture of G. Fan and A. Raspaud asserts that every bridgeless cubic graph contains three perfect matchings with empty intersection. We suggest a possible approach to problem...