作者victor7935 (victor)
看板trans_math
标题[微分] 极限问题
时间Thu Oct 2 19:57:54 2008
有2题证明需要各位帮忙!!
1.
Let f and g be continuous at c. Prove that if
f(c) > 0, then there exist δ > 0 such that
f(x) > 0 for all x 属於(c-δ,c+δ)
2.Prove that if f(c) > 0 and lim f(x) exist,then f(x) > 0 for
x→c
all x in an interval of the form (c-r,c+r)
谢谢...
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※ 编辑: victor7935 来自: 140.123.221.147 (10/04 16:57)
※ 编辑: victor7935 来自: 140.123.221.147 (10/04 22:32)