Angewandte Mathematik Und Informatik Universit at Zu K Oln Colouring Graphs with Prescribed Induced Cycle Lengths
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چکیده
In this paper we study the chromatic number for graphs with two prescribed induced cycle lengths. It is due to Sumner that triangle-free and P 5-free and triangle-free, P 6-free and C 6-free graphs are 3-colourable. A canonical extension of these graph classes is G
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