期刊名称：International Journal of Mathematics and Mathematical Sciences
印刷版ISSN：0161-1712
电子版ISSN：1687-0425
出版年度：1989
卷号：12
DOI：10.1155/S016117128900075X
出版社：Hindawi Publishing Corporation
摘要：Upper and lower solutions are used in establlsning global existence results for certain two–point boundary value problems for y‴=f(x,y,y′,y″)
and y(n)=f(x,y,y′,...,y(n−1)).
