A Semigroup of Simple Homotopy Types.
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Allan J. Sieradski (1977)
Mathematische Zeitschrift
Brown, Ronald, Wensley, Christopher D. (1996)
Theory and Applications of Categories [electronic only]
Maria Moszyńska (1978)
Fundamenta Mathematicae
John W. Morgan (1986)
Publications Mathématiques de l'IHÉS
(1993)
Compositio Mathematica
Katsuya Eda, Kazuhiro Kawamura (2000)
Fundamenta Mathematicae
For the n-dimensional Hawaiian earring n ≥ 2, and is trivial for each 1 ≤ i ≤ n - 1. Let CX be the cone over a space X and CX ∨ CY be the one-point union with two points of the base spaces X and Y being identified to a point. Then for n ≥ 1.
S. Singh (1988)
Colloquium Mathematicae
Katsuya Eda (2010)
Fundamenta Mathematicae
Let X and Y be one-dimensional Peano continua. If the fundamental groups of X and Y are isomorphic, then X and Y are homotopy equivalent. Every homomorphism from the fundamental group of X to that of Y is a composition of a homomorphism induced from a continuous map and a base point change isomorphism.
Kazuhiro Kawamura (2003)
Colloquium Mathematicae
We study the (n+1)st homotopy groups and the shape groups of the (n-1)-fold reduced and unreduced suspensions of the Hawaiian earring.
Hans Werner Henn (1986)
Manuscripta mathematica
Vagn Lundsgaard Hansen (1974)
Mathematica Scandinavica
Hans Joachim Baues (1976)
Compositio Mathematica
Werner End (1980)
Mathematische Annalen
John W. Morgan (1978)
Publications Mathématiques de l'IHÉS
Ronald Brown, Lew Hardy, S.A. Morris (1975)
Mathematische Zeitschrift
Frederick R. Cohen (1983)
Mathematische Zeitschrift
Irene Llerena (1992)
Compositio Mathematica
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