On the proof of the directed graph n·_5(n≡0(mod2)) is a graceful graph
Liu De · 2002
Using the structure method,we show that(1)n·C→ 5 is a graceful graph if and only if n≡0(mod2);(2) in graceful graph n·C→ 5,the sum of arc graceful value of C→ 5 (i) is 2(q+1) when n≡0(mod2) and 1≤i≤k;under condition k+1≤i≤2k,the sum of arc graceful value of C→ 5 (i) is 3(q+1).