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On the Gracefulness of the Digraphs n • C_m~*

机译:关于有向图n•C_m〜*的优美性

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A digraph D(V, E) is said to be graceful if there exists an injection f : V(G) → {0,1, ... , ∣E∣} such that the induced function f' : E(G) → {1, 2, ... , ∣E∣} which is defined by f' (u, v) = [f(v) - f(u)] (mod ∣E∣ + 1) for every directed edge (u, v) is a bijection. Here, f is called a graceful labeling (graceful numbering) of D(V, E), while f' is called the induced edge's graceful labeling of D. In this paper we discuss the gracefulness of the digraph n · C_m and prove that n • C_m is a graceful digraph for m = 15,17 and even n.
机译:如果存在射入f:V(G)→{0,1,...,∣E∣}使得诱导函数f':E(G),则有向图D(V,E)被认为是优美的。 →{1,2,...,∣E∣},对于每个有向边,其定义为f'(u,v)= [f(v)-f(u)](mod E∣ + 1)( u,v)是双射。在这里,f称为D(V,E)的优美标号(优美编号),而f'称为D的诱导边的优美标号。在本文中,我们讨论了有向图n·C_m的优美程度,并证明了n •C_m是优美的有向图,其中m = 15,17甚至n。

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