As far as the second eigenvalue problem was concerned, the expansion theorem was proved by the theory of completely continuous operator (compact operator).
另外，用全连续算子方法证明了第二个特征值问题的特征展开定理。
参考来源 - 两个周期边界条件下常微分算子特征值秩的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
本文讨论可数模空间上全连续算子的有限维逼近定理及该空间的一些性质。
In this paper the properties and fixed point theorems of completely continuous maps on denumerable norm Spaces are studied.
本文得到全连续算子和锥映象的新的歧点和渐近歧点定理，并指出它们的固有值的某种全局特征。
We get a new theorem of the ambiguous points and a new theorem of the asgmptotic ambiguous point on the condensing mapping, and we point out some global characteristics of their eigenvalues.
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