推 Eliphalet :微分等於 0 01/26 10:10
→ alasa15 :嗯 推樓上 兩邊同除|x-y|再用夾逼定理(先固定一個) 01/26 19:26
Let f be a function from Ｒ into Ｒ. Suppose that │f(x)-f(y)│≦ 2│x-y│^1.01
for x,y belongs to Ｒ. Show that f is a constant function on Ｒ.
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