328 search results - page 47 / 66 » Graph Algebras for Bigraphs |
JCT
2006
13 years 7 months ago
2006
We study the Bergman complex B(M) of a matroid M: a polyhedral complex which arises in algebraic geometry, but which we describe purely combinatorially. We prove that a natural su...
MFCS
2009
Springer
14 years 2 months ago
2009
Springer
Functional graph grammars are finite devices which generate the class of regular automata. We recall the notion of synchronization by grammars, and for any given grammar we consid...
CIE
2009
Springer
13 years 11 months ago
2009
Springer
An arithmetic circuit is a labelled, directed, acyclic graph specifying a cascade of arithmetic and logical operations to be performed on sets of non-negative integers. In this pap...
ARSCOM
2007
13 years 7 months ago
2007
A subset D of the vertex set V of a graph is called an open oddd dominating set if each vertex in V is adjacent to an odd number of vertices in D (adjacency is irreflexive). In t...
SODA
2010
ACM
13 years 6 months ago
2010
ACM
We present an exact algorithm that decides, for every fixed r ≥ 2 in time O(m) + 2O(k2 ) whether a given multiset of m clauses of size r admits a truth assignment that satisfi...