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：1998
卷号：21
DOI：10.1155/S0161171298000398
出版社：Hindawi Publishing Corporation
摘要：The contractive conditions of Popa (Demonstr. Math. 1990, 23, 213-218) were
further improved for four non-surjective expansion mappings, and some common
fixed point theorems under semi-compatible pairs of mappings are proved. Our
main findings bring improvements to a number of results in the non-metric
setting. Some implications for mathematical physics are raised with respect to
physical invariants
