作者xx52002 (冰清影)
看板Math
标题[分析] 证明一题
时间Wed Jan 26 03:56:18 2011
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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