When this system has harvesting rate, we have also proved that if there is a positive equilibrium point in the system, it is then globally unstable.
当该系统具有收获率时，证明了该系统若存在正平衡点，则它是全局不稳定性。
In this article, the author has proved the theorem of "middle point" in the second integral mean value.
给出并证明了关于积分第二中值定理“中间点”的渐近性定理。
The conceptions of DL3-similarity degree and pseudo-metric on two formulas are given. DL3-logic metric space is built. And it is proved that this space has no isolated point.
给出了两公式间的DL3 -相似度与伪距离的概念，并建立了DL3 -逻辑度量空间，证明了此空间没有孤立点。
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