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Independent cycles and paths in bipartite balanced graphs

Beata Orchel, A. Paweł Wojda (2008)

Discussiones Mathematicae Graph Theory

Bipartite graphs G = (L,R;E) and H = (L’,R’;E’) are bi-placeabe if there is a bijection f:L∪R→ L’∪R’ such that f(L) = L’ and f(u)f(v) ∉ E’ for every edge uv ∈ E. We prove that if G and H are two bipartite balanced graphs of order |G| = |H| = 2p ≥ 4 such that the sizes of G and H satisfy ||G|| ≤ 2p-3 and ||H|| ≤ 2p-2, and the maximum degree of H is at most 2, then G and H are bi-placeable, unless G and H is one of easily recognizable couples of graphs. This result implies easily that for integers...

Induced-paired domatic numbers of graphs

Bohdan Zelinka (2002)

Mathematica Bohemica

A subset D of the vertex set V ( G ) of a graph G is called dominating in G , if each vertex of G either is in D , or is adjacent to a vertex of D . If moreover the subgraph < D > of G induced by D is regular of degree 1, then D is called an induced-paired dominating set in G . A partition of V ( G ) , each of whose classes is an induced-paired dominating set in G , is called an induced-paired domatic partition of G . The maximum number of classes of an induced-paired domatic partition of G is the induced-paired domatic...

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