两个最著名的标号是优美标号和协调标号。
The two best konwn labeling methods are calls graceful and harmonious labeling.
本文给出变形树的优美标号，从而证明了变形树的优美性。
A graceful labeling for deformation tree is given in this paper. In this way, the gracefulness of deformation trees are proved.
这些充要条件为判定树的优美性及求优美标号提供了算法。
These conditions provide the algorithm for obtaining pleasant marks as well as judging pleasant trees.
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