回复:f(1,1,1,1)=5意思是1,1,1,1用加减乘除算不出5。问题是怎样证明算不出5?
You are right,It is very hard to verify "impossibility."Find the bound is possible...
所有跟帖:
• 只能说我目前没算出5来。。。。 -被迫注册的- ♂ (0 bytes) () 07/19/2010 postreply 21:56:22