angular derivative meaning in English

角导数
角微离
角微商

In the second chapter we study the properties of the weighted dirichlet - type spaces and composition operators on them . we not only characterize these spaces by taylor series , but also give sufficient and necessary conditions in terms of carleson measure for the boundedness and compactness of composition operator . moreover , we apply the comparability propositions which induced from above sufficient and necessary conditions to discuss the relationships between the compactness of composition operator cv and angular derivative or innerness of the inducing function , and so on
本文讨论了一类函数空间相互的包含关系，而对其中的加权dirichlet型空间，不但给出了空间的相互包含关系，并且对它进行了级数刻画；利用carleson测度，刻画了加权dirichlet型空间上复合算子的有界性及紧性，并利用由此得到的比较性命题讨论了复合算子的紧性与角导数，内函数等的关系。