Cao Hui-zhen
Abstract
A necessary and sufficient condition of double limit existentially was given based on the analysis of limit of many variable when variables trend to a point,and the conclution was generalized to variables trend to infinity.
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A necessary and sufficient condition of double limit existentially was given based on the analysis of limit of many variable when variables trend to a point,and the conclution was generalized to variables trend to infinity.
Key concepts: Mathematics, Limit (mathematics), Infinity, Limit point, Variable (mathematics), Applied mathematics, Mathematical analysis, Calculus (dental)