In this paper is studied the gracefulness of a class of join graphs derived from the graceful tree and related graphs. Some results are given.

本文研究了优美树的一类联图的优美性，证明了这类图是优美图，同时还得到两类由它导出的优美图。

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In this paper is studied the gracefulness of a class of join graphs derived from the graceful tree and related graphs. Some results are given.

本文研究了优美树的一类联图的优美性，证明了这类图是优美图，同时还得到两类由它导出的优美图。

youdao