[分析] 高微(30)

[PttFund (批踢踢基金)]

If f is an increasing function on [a,b], then

(1) f(c+) and f(c-) both exist for any c in (a,b),
(2) f(c-)≦f(c)≦f(c+),
(3) f(a)≦f(a+) and f(b-)≦f(b).

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