Zhu introduced the conception of circular perfect graph and gave a preliminary research[6, 7].

The grace of sad——On neoclassical style of CAO Wenxuan;

This paper mainly talks about aesthetic form of plaza,analyze two aesthetic forms in details,one is the grace form which is grand and powerful ,the other is sublime form which has more consideration for people and has fitting scale.

Regardless of the similarities between sublime and magnificence, we compare differences between sublime and grace in ten respects.

In this paper,we obtain three kinds of graphs by adding some vertices and some edges on,and proved that the three kinds of graphs not only are allgraceful,odd graceful,but also are balanced graphs and alternating graphs.

A group of graceful labeling of caterpillar-tree is giving by a kind of new method.

When n≡0(mod 2),for any positive integers k and when n≡1(mod 2),for positive integers k≤(n-1)/2 +t-1 or k=(n-1)/2 +1,the k-gracefulness of a kind of unicyclic graph C+tn is proved.

Chinese aesthetes, influenced by western aesthetics, traditional classifies the forms of beauty into elegance, loftiness (or majesticity), tragedy, comedy, farce, and humor.

The philosophical foundation of elegance is naive dialectics, while that of sublimeness is mechanic metaphysics.