This paper has given a pithy analytic Proof of "principal diameter circle"Theorem. And on the basis of the thought of the theorem. We obtain two theorem about ellipse normal.
本文对主经圆定理给出了一个简练的解析证明，并且在此定理的思想基础上，得到了椭圆上法线的两个性质定理。
In the proof a new analytic technique in the study of the strong limit theorems for Markov chains is applied.
证明中应用了研究马尔可夫链强极限定理的一种新的分析方法。
In the proof a new analytic technique in the study of the strong limit theorems for Markov chains is applied.
证明中应用了研究马尔可夫链强极限定理的一种新的分析方法。
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