第一类间断点
- 网络discontinuity point of the first kind
第一类间断点-
设函数f（x）连续于[a，b]或只有第一类间断点。
Let a function f ( x ) is continuous on [ α, b ] or has at most discontinuity of the first kind at point x.
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讨论导函数的若干性质：导函数具有介值性、导函数无第一类间断点。
The paper discussed the characters of derivatives that it has the character of intermediate value property and it has no the character of the discontinuity points of the first kind .