Causal difference equations with upper and lower solutions in the reverse order

被引:0
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作者
Wen-Li Wang
Jing-Feng Tian
机构
[1] China University of Geosciences Great Wall College,Department of Basic Course
[2] North China Electric Power University,College of Science and Technology
关键词
Upper and lower solutions method; Causal operators; Extremal solutions; Coupled extremal quasi-solutions; 34B15; 39A10;
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中图分类号
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摘要
This paper is devoted to studying the existence conditions for difference equations involving causal operators in the presence of upper and lower solutions in the reverse order. To this end, we prove some new comparison theorems and develop the upper and lower solutions method. Our results improve and extend some relevant results in difference equations. Two examples are given to illustrate the obtained results.
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