回复：I like math, not myth nor mystification

continue your reasonning...correctly

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

We have also f(f(f(t))=f(t) + 2011

so f(t+2011) = f(t) + 2011

etc...

所有跟帖： 

• 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