Pełnotekstowe zasoby PLDML oraz innych baz dziedzinowych są już dostępne w nowej Bibliotece Nauki.
Zapraszamy na https://bibliotekanauki.pl
Preferencje help
Polish version English version Język
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 4

Liczba wyników na stronie
first rewind previous Strona / 1 next fast forward last

Wyniki wyszukiwania

help Sortuj według:

help Ogranicz wyniki do:
first rewind previous Strona / 1 next fast forward last
1
Content available remote

Two-to-one maps on solenoids and Knaster continua

100%
Dębski W.
Fundamenta Mathematicae
|
1992
|
tom 141
|
nr 3
277-285
XX
It is shown that 2-to-1 maps cannot be defined on certain solenoids, in particular on the dyadic solenoid, and on Knaster continua.
2
Content available remote

Composant-like decompositions

63%
Dębski W., Tymchatyn E. D.
Fundamenta Mathematicae
|
1991-1992
|
tom 140
|
nr 1
69-78
EN
The body of this paper falls into two independent sections. The first deals with the existence of cross-sections in $F_σ$-decompositions. The second deals with the extensions of the results on accessibility in the plane.
3
Content available remote

Exactly two-to-one maps from continua onto arc-continua

51%
Dębski W., Heath J., Mioduszewski J.
Fundamenta Mathematicae
|
1996
|
tom 150
|
nr 2
113-126
EN
Continuing studies on 2-to-1 maps onto indecomposable continua having only arcs as proper non-degenerate subcontinua - called here arc-continua - we drop the hypothesis of tree-likeness, and we get some conditions on the arc-continuum image that force any 2-to-1 map to be a local homeomorphism. We show that any 2-to-1 map from a continuum onto a local Cantor bundle Y is either a local homeomorphism or a retraction if Y is orientable, and that it is a local homeomorphism if Y is not orientable.
4
Content available remote

Exactly two-to-one maps from continua onto some tree-like continua

51%
Dębski W., Heath J., Mioduszewski J.
Fundamenta Mathematicae
|
1992
|
tom 141
|
nr 3
269-276
EN
It is known that no dendrite (Gottschalk 1947) and no hereditarily indecomposable tree-like continuum (J. Heath 1991) can be the image of a continuum under an exactly 2-to-1 (continuous) map. This paper enlarges the class of tree-like continua satisfying this property, namely to include those tree-like continua whose nondegenerate proper subcontinua are arcs. This includes all Knaster continua and Ingram continua. The conjecture that all tree-like continua have this property, stated by S. Nadler Jr. and L. E. Ward Jr. (1983), is still neither confirmed nor rejected.
first rewind previous Strona / 1 next fast forward last
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.