More non-analytic classes of continua

被引:7
作者
Krupski, P
机构
[1] Univ Wroclaw, Inst Math, PL-50384 Wroclaw, Poland
[2] Univ Nacl Autonoma Mexico, Inst Matemat, Mexico City 04510, DF, Mexico
关键词
coanalytic set; coanalytic complete; chainable continuum; inverse limit; clump of continua; lambda-dendroid; tree-like continuum; pseudo-arc; pseudo-solenoid; countable-dimensional; weakly infinite-dimensional;
D O I
10.1016/S0166-8641(02)00094-9
中图分类号
O29 [应用数学];
学科分类号
070104 ;
摘要
The method of [U. Darji, Topology Appl. 103 (2000) 243-248] is extended to get the coanalytic hardness of many classes of metric continua. For instance: (1) the family of all continua in I-n, n greater than or equal to 2, that admit only arcs (simple closed curves) as chainable (circularly chainable) subcontinua is coanalytic complete; (2) the family of all continua in I-n, n greater than or equal to 2 (n greater than or equal to 3), which contain no copy of a given nondegenerate chainable (circularly chainable) continuum Y is coanalytic hard; if Y is an arc or a pseudo-arc (a simple closed curve or a pseudo-solenoid), then the family is coanalytic complete; (3) the family of all tree-like continua that contain no hereditarily decomposable subcontinua is coanalytic hard; (4) the family of all lambda-dendroids that contain no arcs is coanalytic complete; (5) the sets of all countable-dimensional continua and of all weakly infinite-dimensional continua in the Hilbert cube are coanalytic hard; strongly countable-dimensional continua form a coanalytic complete family. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:299 / 312
页数:14
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