You are right,It is very hard to verify "impossibility."Find the bound is possible...
回複:f(1,1,1,1)=5意思是1,1,1,1用加減乘除算不出5。問題是怎樣證明算不出5?
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隻能說我目前沒算出5來。。。。
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07/19/2010 postreply
21:56:22