实数集、自然数集与时标的比较  

Comparisons of Real Number Sets,Natural Number Sets and Time Scales

作　　者：黄星寿 银冬冬 HUANG Xingshou;YIN Dongdong(Department of mathematics and statistics,Hechi University,Hechi,Guangxi 546300,China)

机构地区：[1]河池学院数学与统计学院

出　　处：《河池学院学报》2019年第2期38-42,共5页Journal of Hechi University

基　　金：广西自然科学基金资助项目(2016GXNSFAA380090,2016GXNSFAA380125)

摘　　要：本研究先介绍了前跳算子、后跳算子、离散点、稠密点、粗细度算子和Δ导数等时标的相关概念,然后利用所给概念对不同时标的结构内涵进行了比较,最后给出不同时标下Δ导数的计算公式.This paper first introduces the concepts of forward jump operator,backward jump operator,discrete point,dense point,graininess operator and derivative,then compares the structure of different time scales by using the concepts given.Finally,the formulas for calculating the derivatives under different scales are given.

关 键 词：时标 前跳算子 离散点 稠密点 Δ导数 

分 类 号：O178[理学—数学]