| http://www.w3.org/ns/prov#value | - In the article, the isolated singularity, removable singularity, zero, pole, essential singularity and other concepts and properties were used; Two lemmas on the isolated singularity were proved first, and to use these lemmas, one property of essential singularity was proved then.Key words: Analytic function; Isolated singularity; Essential singularity; Laurent expansion
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