http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
XIA LIU,TAO ZHOU,HAIPING SHI 한국전산응용수학회 2018 Journal of applied mathematics & informatics Vol.36 No.5
In this article, we consider a fourth order nonlinear dierence system. By making use of the critical point theory, we obtain some new existence theorems of at least one periodic solution with minimal period. Our main approach used in this article is the variational technique and the Saddle Point Theorem.