[離散] 同餘證明
Prove or disprove that for all f: N→N and for all t∈N,
there exist distinct i,j∈{0,1,...,3^(t+3)} satisfying
f(i+k)≡f(j+k) (mod 3)
for all k∈{0,1,...,t}.
太久沒有碰離散了,剛剛被朋友問倒QQ
有請版上的大大幫忙,謝謝!
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