I like the people who like Math. Let me tell you the detail.

At first, your 1) is not strict logic. Your anwser only proved there is no f(x)=x+c.

We have f(f(t))=t+2011,so,f(f(f(t))=f(t+2011),We have f(t)=f(t+2011).So,.....

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• 回复：I like math, not myth nor mystification -15少- ♂ (266 bytes) () 06/02/2011 postreply 17:24:06

• You at first you don't think f(N1)=N2,so,I ,,,,your deduce prove -jinjing- ♀ (164 bytes) () 06/02/2011 postreply 18:23:04