复变函数的极限.docVIP

复变函数的极限 于秀芝 (渤海大学数学系 辽宁 锦州 121000 中国 ) 摘要：这是一篇讨论复变函数极限的论文，把我们所熟悉的数学分析中实变函数极限的定义、定理、性质，推广到复变函数中，并加以证明。但是实变函数极限的定义、定理、性质，并不完全适用于复变函数。例如：复变函数的极限没有保序性、正性，复变函数没有左、右极限等等。同时，复变函数极限的定义与数学分析中的二元函数极限的定义相似，故它又具有二元函数的某些性质。本篇论文由四个方面组成。首先，我们讨论的是复变函数在某个定点时极限的定义，即描述性极限的定义和表达式极限的定义。其次，我们讨论的是复变函数极限的定理，如Heine定理、Cauchy 准则、复合函数极限的定理等等，并给出了详细的证明。再次，我们讨论的是复变函数极限的性质，即唯一性、绝对值的极限、局部有界性、四则运算法则等等，同时，我们也给了详细的证明。最后，我们讨论的是复变函数在无穷远点的极限。在这方面，我们将极限从有限的定点逐渐引入到无穷远点，进而给出了函数在无穷远点处极限的定义、运算法则、定理，并给予了相应的应用。 关键词：Heine 定理 Cauchy 准则 极限 复数列 Complex variable function limit Yu Xiuzhi (Department of Mathematics Bohai University Liaoning Jinzhou 121000 China) Abstract：This is a discussion about complex variable function limit paper. It promotes the definition, theorem, nature of the real variable function limit to the complex variable function limit and performs to prove it .But the definition, the theorem, the nature of the real variable function limit aren’t completely suitable for the complex variablefunction.For example, complex variable function limit doesn’t have order nature,positive nature , and complex variable function doesn’t have left limit and right limit , and so on . Simultaneously,the definition of the complex variable function limit and the definition of the dual function limit of mathematica lanalysis is similar.So it also has some natures of dual function limit.This paper has four aspects.First,We discuss the defination of the complex variable function in some apex time , namely the definition of description limit and the definition of expression limit.Next,we discuss the theorem of the complex variable function limit.For example ,Heine theorem, Cauchy criterion,the theorem of composite function limit,and so on. And it has produced the detailed proof. Once more,we discuss the nature of the complex variable function limit. Namely unique nature , absolute value limit nature ,partially having nature, mathematical operations principle nature ,and so on . At the same time, we have also