常慧杰,桑彥彬
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滿足弱壓縮條件及性質的4個映射公共不動點定理
常慧杰[1],桑彥彬
(中北大學 理學院,山西 太原 030051)
利用偶爾弱相容自映射與性質,建立了一類4個映射公共不動點的存在性定理,其中4個映射皆滿足弱壓縮條件.
4映射;公共不動點;偶爾弱相容
1引言及預備知識
定義1[3]設和是度量空間中的自映射.如果對于中的某個成立,則稱為和的一個重合點,和在中重合點的集合記為,稱為和的重合像點.
定義2[4]如果在中存在一個序列,使得對于中的某個成立,則稱滿足性質.
定義3[5]如果存在,使得成立,則稱為偶爾弱相容.
定義4[6]令是一個度量空間,,,,為中的4個自映射.若在中存在序列和,使得對于中的某個成立,則稱和滿足公共性質.
引理[7]令,則,且時,.
2主要結果及證明
考慮
對式(12)兩端取極限,由式(10)和式(11)可知,.所以,因此.
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Common fixed point theorems for four mappings satisfyingweakly contractive conditions and property
CHANG Hui-jie,SANG Yan-bin
(School of Science,North University of China,Taiyuan 030051,China)
By using of occasionally weakly compatible selfmaps and property,established the existence results of common fixed points for four mappings satisfyingweakly contractive conditions.
four mappings;common fixed points;occasionally weakly compatible
O157.5
A doi:10.3969/j.issn.1007-9831.2016.01.006
2015-10-14
中北大學校基金項目
常慧杰(1989-),男,山西太原人,在讀碩士研究生,從事非線性泛函研究.E-mail:852740174@qq.com
桑彥彬(1979-),男,山西澤州人,副教授,博士,從事非線性泛函分析研究.E-mail:sangyanbin@126.com