Closed mappings which lower dimension
James Keesling (1969)
Colloquium Mathematicae
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James Keesling (1969)
Colloquium Mathematicae
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Gerald S. Ungar (1968)
Colloquium Mathematicae
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A. Lelek (1966)
Colloquium Mathematicae
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S. K. Kaul (1967)
Colloquium Mathematicae
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Calvin F. K. Jung (1968)
Colloquium Mathematicae
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M. Reichaw (1972)
Colloquium Mathematicae
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Giovanni Alberti, Giuseppe Buttazzo (1993)
Manuscripta mathematica
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J. Achari (1978)
Matematički Vesnik
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G. Spiliopoulos (1991)
Fundamenta Mathematicae
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Sibe Mardešić (2013)
Bulletin of the Polish Academy of Sciences. Mathematics
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A phantom mapping h from a space Z to a space Y is a mapping whose restrictions to compact subsets are homotopic to constant mappings. If the mapping h is not homotopic to a constant mapping, one speaks of an essential phantom mapping. The definition of (essential) phantom pairs of mappings is analogous. In the study of phantom mappings (phantom pairs of mappings), of primary interest is the case when Z and Y are CW-complexes. In a previous paper it was shown that there are no essential...
Edward E. Grace (1964)
Colloquium Mathematicae
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(1959-1960)
Compositio Mathematica
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J. J. Charatonik, W. J. Charatonik, S. Miklos
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CONTENTS1. Introduction.......................................................52. Preliminaries ....................................................83. General properties .........................................114. Mappings onto fans........................................145. Mappings onto an arc.....................................206. A characterization of the top...........................277. Open mappings and their lightness................288. Inverse limits...................................................399....
Hadi Seyedinejad, Ali Zaghian (2015)
Annales Polonici Mathematici
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We study the topological invariant ϕ of Kwieciński and Tworzewski, particularly beyond the case of mappings with smooth targets. We derive a lower bound for ϕ of a general mapping, which is similarly effective as the upper bound given by Kwieciński and Tworzewski. Some classes of mappings are identified for which the exact value of ϕ can be computed. Also, we prove that the variation of ϕ on the source space of a mapping with a smooth target is semicontinuous in the Zariski topology. ...
B. Fisher (1978)
Colloquium Mathematicae
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