Hereditarily σ-connected continua
J. Grispolakis, E. D. Tymchatyn (1979)
Colloquium Mathematicae
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J. Grispolakis, E. D. Tymchatyn (1979)
Colloquium Mathematicae
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Jo Heath, Van C. Nall (2003)
Fundamenta Mathematicae
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In 1940, O. G. Harrold showed that no arc can be the exactly 2-to-1 continuous image of a metric continuum, and in 1947 W. H. Gottschalk showed that no dendrite is a 2-to-1 image. In 2003 we show that no arc-connected treelike continuum is the 2-to-1 image of a continuum.
Janusz Charatonik (1964)
Fundamenta Mathematicae
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J. Krasinkiewicz, Piotr Minc (1979)
Fundamenta Mathematicae
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Roman Mańka (1987)
Colloquium Mathematicae
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A. Emeryk, A. Szymański (1977)
Colloquium Mathematicae
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T. Maćkowiak (1976)
Fundamenta Mathematicae
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Charatonik, Janusz J. (2003)
International Journal of Mathematics and Mathematical Sciences
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T. Maćkowiak (1977)
Fundamenta Mathematicae
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Hatch, Jonathan, Stanojević, Č.V. (2003)
Publications de l'Institut Mathématique. Nouvelle Série
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Lončar, Ivan (2008)
Analele Ştiinţifice ale Universităţii “Ovidius" Constanţa. Seria: Matematică
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J. Krasinkiewicz, Piotr Minc (1979)
Fundamenta Mathematicae
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Acosta, Gerardo, Charatonik, Janusz J. (2004)
Mathematica Pannonica
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J. Krasinkiewicz, Sam Nadler (1978)
Fundamenta Mathematicae
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