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The property RNT on dendroids

Veronica Martinez-de-la-Vega

Sažetak

A continuum is said to be retractable onto near trees (abbreviating RNT) provided that for each > 0 there exists > 0 such that if T is a tree in X and H(T,X) < , then there exists an -retraction r of X onto T. In this paper it is proved that an arcwise connected continuum with the property RNT is a dendroid. We focus our study on dendroids. Dendrites are characterized as: (a) smooth dendroids with property RNT, (b) dendroids with the property RNT hereditarily. Finally, an example of a nonlocally connected dendroid with property RNT is shown.

Ključne riječi

Continuum; dendrite; dendroid; retraction; tree

Hrčak ID:

4805

URI

https://hrcak.srce.hr/4805

Datum izdavanja:

1.12.2002.

Posjeta: 890 *