Abstract

The problem of complementary cycles in tournaments and bipartite tournaments was completely solved. However, the problem of complementary cycles in semicomplete n -partite digraphs with n ≥3 is still open. Based on the definition of weakly complementary cycles, we get the following result. Let D be a 2 -strong n -partite tournament that is not a tournament, where n ≥6 . Let C be a 3 -cycle of D and D-V(C) be nonstrong. For the unique acyclic sequence D <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</sub> ,D <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> ,..., D <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">α</sub> of D-V(C), where α≥2 , if 1 |V(D <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">α+1-i</sub> )|= 1, D <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">i</sub> contains cycles for i = 1 or i = α, then D contains a pair of weakly complementary cycles.

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