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- W2035448462 abstract "Given two graphs G = (X, E), H = (Y, F); If A ⊂ X and if f is a function from A to Y, we pose the problem of deciding if f can be extended into a homomorphism from G to H. We know how to solve this problem when H is, for instance, a tree, or a chordal graph. We give here a solution to this problem when g is a planar graph and H is a cycle of G; The solution involves homotopy techniques." @default.
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- W2035448462 date "1985-03-01" @default.
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- W2035448462 title "A retraction problem in graph theory" @default.
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- W2035448462 doi "https://doi.org/10.1016/0012-365x(85)90062-7" @default.
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