208 search results - page 8 / 42 » Improved upper bounds on the crossing number |
CORR
2010
Springer
13 years 7 months ago
2010
Springer
We obtain improved upper bounds and new lower bounds on the chromatic number as a linear function of the clique number, for the intersection graphs (and their complements) of fini...
COMGEO
2011
ACM
13 years 2 months ago
2011
ACM
A drawing of a graph in the plane is called a thrackle if every pair of edges meets precisely once, either at a common vertex or at a proper crossing. Let t(n) denote the maximum ...
LATA
2009
Springer
14 years 2 months ago
2009
Springer
In this paper we investigate the computational complexity of knot theoretic problems and show upper and lower bounds for planarity problem of signed and unsigned knot diagrams repr...
CORR
2010
Springer
13 years 4 months ago
2010
Springer
We present a method for proving upper bounds on the eigenvalues of the graph Laplacian. A main step involves choosing an appropriate "Riemannian" metric to uniformize th...
TIT
2008
13 years 7 months ago
2008
For a linear code , the stopping redundancy of is defined as the minimum number of check nodes in a Tanner graph T for such that the size of the smallest stopping set in T is equal...