[分析] 證明 x^r 是 Holder 連續

[kyoiku (生死間有大恐怖)]

Show that

f(x) = x^r on (0,oo) with 0 < r < 1

is holder continuous


thus there are both b and c > 0 s.t.

|f(x) - f(y)| <= b|x-y|^c for any x,y > 0

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