When is a functionally free algebra free?
T. Evans (1972)
Semigroup forum
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T. Evans (1972)
Semigroup forum
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B. Tilson (1972)
Semigroup forum
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Luigi Grasselli, Salvina Piccarreta (1997)
Forum mathematicum
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Darryl McCullough (1986)
Banach Center Publications
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Friedrich Hegenbarth (1976)
Mathematische Annalen
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Chester, jr. John (1974)
Semigroup forum
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El-Ghoul, M., El-Ahmady, A.E., Abu-Saleem, M. (2007)
APPS. Applied Sciences
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R. Z. Buzyakova, A. Chigogidze (2011)
Fundamenta Mathematicae
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Our main result states that every fixed-point free continuous self-map of ℝⁿ is colorable. This result can be reformulated as follows: A continuous map f: ℝⁿ → ℝⁿ is fixed-point free iff f̃: βℝⁿ → βℝⁿ is fixed-point free. We also obtain a generalization of this fact and present some examples
J. Shafer (1974)
Semigroup forum
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A. J. Kfoury (1988)
Banach Center Publications
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Hentzel, I.R., Peresi, L.A. (2006)
Experimental Mathematics
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T.K. Dey, H. Schipper (1995)
Discrete & computational geometry
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Francesco Costantino (2005)
Fundamenta Mathematicae
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We give a self-contained introduction to the theory of shadows as a tool to study smooth 3-manifolds and 4-manifolds. The goal of the present paper is twofold: on the one hand, it is intended to be a shortcut to a basic use of the theory of shadows, on the other hand it gives a sketchy overview of some of the most recent results on shadows. No original result is proved here and most of the details of the proofs are left out.
H.J. SHYR (1975)
Semigroup forum
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