๐”– Bobbio Scriptorium
โœฆ   LIBER   โœฆ

Short proofs for interval digraphs

โœ Scribed by Douglas B. West


Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
327 KB
Volume
178
Category
Article
ISSN
0012-365X

No coin nor oath required. For personal study only.

โœฆ Synopsis


We give short proofs of the adjacency matrix characterizations of interval digraphs and unit interval digraphs.


๐Ÿ“œ SIMILAR VOLUMES


A short proof of the degree bound for in
โœ Douglas B. West ๐Ÿ“‚ Article ๐Ÿ“… 1989 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 141 KB

A short proof is given of the fact that every graph has an interval representation of depth 2 in which each vertex u is represented by at most &f(u) + 11 intervals, except for an arbitrarily specified vertex w that appears left-most in the representation and is represented by at most [&d(w) + 1)1 in

Human power for short intervals
๐Ÿ“‚ Article ๐Ÿ“… 1880 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 60 KB

## Electric Adhesion of Metal Contaets.--A. Stroh has experimented upon tile ~'~dhesion of two metals in mutual contact during the passage of an electric current. Tile adhesion is manifested most strikinly when the metals touch upon two edges crosswise; it changes with the nature of the metal. S~r

A short proof of the NP-completeness of
โœ Dรกniel Marx ๐Ÿ“‚ Article ๐Ÿ“… 2005 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 154 KB

In the minimum sum coloring problem we have to assign positive integers to the vertices of a graph in such a way that neighbors receive different numbers and the sum of the numbers is minimized. Szkalicki has shown that minimum sum coloring is NP-hard for interval graphs. Here we present a simpler p