Approximable dimension and acyclic resolutions
A. Koyama, R. Sher (1997)
Fundamenta Mathematicae
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A. Koyama, R. Sher (1997)
Fundamenta Mathematicae
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Harald Niederreiter, Chaoping Xing (1997)
Acta Arithmetica
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Friedrich Wehrung (1995)
Fundamenta Mathematicae
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Rüdiger Göbel, Simone Pabst (1998)
Fundamenta Mathematicae
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The paper deals with realizations of R-algebras A as endomorphism algebras End G ≅ A of suitable R-modules G over a commutative ring R. We are mainly interested in the case of R having "many prime ideals", such as R = ℝ[x], the ring of real polynomials, or R a non-discrete valuation domain
Grzegorz Graff (2000)
Fundamenta Mathematicae
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The problem of description of the set Per(f) of all minimal periods of a self-map f:X → X is studied. If X is a rational exterior space (e.g. a compact Lie group) then there exists a description of the set of minimal periods analogous to that for a torus map given by Jiang and Llibre. Our approach is based on the Haibao formula for the Lefschetz number of a self-map of a rational exterior space.
Christian Ballot (1999)
Acta Arithmetica
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Vitalij Chatyrko (1994)
Fundamenta Mathematicae
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The notion of the ordinal product of a transfinite sequence of topological spaces which is an extension of the finite product operation is introduced. The dimensions of finite and infinite ordinal products are estimated. In particular, the dimensions of ordinary products of Smirnov's [S] and Henderson's [He1] compacta are calculated.
Alexis Bès, Ivan Korec (1998)
Fundamenta Mathematicae
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Let Sq denote the set of squares, and let be the squaring function restricted to powers of n; let ⊥ denote the coprimeness relation. Let . For every integer n ≥ 2 addition and multiplication are definable in the structures ⟨ℕ; Bn,⊥⟩ and ⟨ℕ; Bn,Sq⟩; thus their elementary theories are undecidable. On the other hand, for every prime p the elementary theory of ⟨ℕ; Bp,SQp⟩ is decidable.
Jozef Bobok, Ondřej Zindulka (1999)
Fundamenta Mathematicae
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Let X be an uncountable compact metrizable space of topological dimension zero. Given any a ∈[0,∞] there is a homeomorphism on X whose topological entropy is a.