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189
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ENDM
2007
15 years 7 months ago
2007
The circular chromatic number of a graph is a well-studied refinement of the chromatic number. Circular-perfect graphs is a superclass of perfect graphs defined by means of this...
204
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IM
2007
15 years 7 months ago
2007
Vertex pursuit games, such as the game of Cops and Robbers, are a simplified model for network security. In these games, cops try to capture a robber loose on the vertices of the ...
198
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CORR
2002
Springer
15 years 7 months ago
2002
Springer
We introduce a new measure for planar point sets S that captures a combinatorial distance that S is from being a convex set: The reflexivity (S) of S is given by the smallest numb...
163
Voted
DM
1998
15 years 7 months ago
1998
Let β(G), Γ(G) and IR(G) be the independence number, the upper domination number and the upper irredundance number, respectively. A graph G is called Γperfect if β(H) = Γ(H),...
201
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IAJIT
2011
15 years 2 months ago
2011
: There are many known Arabic lexicons organized on different ways, each of them has a different number of Arabic words according to its organization way. This paper has used mathe...