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A First Course in Graph Theory and Combinatorics [PDF]

open access: bronze, 2009
Sebastian M. Cioabă, M. Ram Murty
openalex   +1 more source

Circular Chromatic Number of Signed Planar Graphs Without Cycles of Length 4 to 9

open access: yesMathematics
Given a signed graph (G,σ) and a positive real number r, if there exists a vertex mapping c:V(G)→[0,r) satisfying that for every positive edge wx, 1≤|c(w)−c(x)|≤r−1 and for every negative edge wx, |c(w)−c(x)|≤r2−1 or |c(w)−c(x)|≥r2+1, then (G,σ) admits a
Chunyan Wei
doaj   +1 more source

Polyhedral Combinatorics [PDF]

open access: green, 1991
William J. Cook, Paul Seymour
openalex   +1 more source

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