刘冬红,张树义,郑晓迪.二元函数柯西中值定理“中间点”的渐近估计式[J].井冈山大学自然版,2017,(4):13-17,37 |
二元函数柯西中值定理“中间点”的渐近估计式 |
ASYMPTOTIC ESTIMATION FORMULA OF THE “INTERMEDIATE POINT” IN THE CAUCHY MEAN VALUE THEOREM FOR TWO VARIABLE FUNCTIONS |
投稿时间:2017-01-03 修订日期:2017-05-25 |
DOI:10.3969/j.issn.1674-8085.2017.04.003 |
中文关键词: 比较函数 二元函数柯西中值定理 中间点 洛必达法则 |
英文关键词: comparison function Cauchy mean value theorem for two variable functions intermediate point L'Hôpital's rule |
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中文摘要: |
研究了二元函数柯西中值定理"中间点"(x0+θ△x,y0+θ△x),当点B(x0+△x,y0+△y)沿AB连线趋向于点A(x0,y0)时的渐近性态,利用比较函数概念,在一定条件下证明了二元函数柯西中值定理"中间点"(x0+θ△x,y0+θ△x)新的渐近性定理,获得了渐近估计式统一和发展了有关文献中的相应结果。 |
英文摘要: |
We study asymptotic behavior of the "intermediate point" (x0 +θ△x, y0+θ△x) in the Cauchy mean value theorem for two variable functions when point B(x0 + △x, y0+△y) approaches point A(x0,y0) along line segment AB. Based on the concept for comparison function, the new asymptotic behavior theorems of the "intermediate point" (x0 +θ△x, y0+θ△x) in the Cauchy mean value theorem for two variable functions are proved under certain conditions, we obtain asymptotic estimation formula to unify and extend corresponding results of some reference. |
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