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§ 1.Introduction All maps considered in this paperare continuous.According to the papers of Xiong J.C.and Ye X.D.etal.,the depth of the center of f is atmost2 when f is a map on theunit interval(see[1 ] ) ;at most3 when f is a map on a tree(see[2 ] ) ;at most4 whenf is a map on the Warsaw circle(see[3 ] ) .In this note,an upper bound ofthe depth ofthe center of a map on a class of continua is obtained. By a continuum we mean a compact connected metric space.A subcontinuum is asubset o… 相似文献
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