讨论了非连通图C4(r1,0,0,0)U C8(r2,O,r3,0,r4,0,0)的优美性,用构造性的方法给出非连通图C4(r1,0,0,0)u C8(r2,0,r3,0,r4,0,0)的优美标号.
The gracefulness of the Graph C4 ( r1,0, 0,0 ) U C8 ( r2,0, r3,0, r4,0,0,0 ) is discussed. The graceful la- belings are given.