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Tytuł:
Varieties of topological groups, Lie groups and SIN-groups
Autorzy:
Hofmann, Karl
Morris, Sidney
Stroppel, Markus
Powiązania:
https://bibliotekanauki.pl/articles/966844.pdf
Data publikacji:
1996
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
pro-Lie group
varieties of topological groups
IN-group
SIN-group
Lie group
Opis:
In this paper we answer three open problems on varieties of topological groups by invoking Lie group theory. We also reprove in the present context that locally compact groups with arbitrarily small invariant identity neighborhoods can be approximated by Lie groups
Źródło:
Colloquium Mathematicum; 1996, 70, 2; 151-163
0010-1354
Pojawia się w:
Colloquium Mathematicum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Factors of ergodic group extensions of rotations
Autorzy:
Kwiatkowski, Jan
Powiązania:
https://bibliotekanauki.pl/articles/1293047.pdf
Data publikacji:
1992
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
group extension
Opis:
Diagonal metric subgroups of the metric centralizer $C(T_φ)$ of group extensions are investigated. Any diagonal compact subgroup Z of $C(T_φ)$ is determined by a compact subgroup Y of a given metric compact abelian group X, by a family ${v_y : y ∈ Y}$, of group automorphisms and by a measurable function f:X → G (G a metric compact abelian group). The group Z consists of the triples $(y,F_y,v_y)$, y ∈ Y, where $F_y(x) = v_y(f(x)) - f(x+y)$, x ∈ X.
Źródło:
Studia Mathematica; 1992, 103, 2; 123-131
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Homotopy and homology groups of the n-dimensional Hawaiian earring
Autorzy:
Eda, Katsuya
Kawamura, Kazuhiro
Powiązania:
https://bibliotekanauki.pl/articles/1205021.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
homology group
Čech homotopy group
n-dimensional Hawaiian earring
Opis:
For the n-dimensional Hawaiian earring $ℍ_n,$ n ≥ 2, $π _n(ℍ_n,o)≃ ℤ^ω$ and $π_i(ℍ_n, o)$ 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 $H_n(X∨Y) ≃ H_{n}(X) ⊕ H_n(Y) ⊕ H_{n}(CX∨CY)$ for n ≥ 1.
Źródło:
Fundamenta Mathematicae; 2000, 165, 1; 17-28
0016-2736
Pojawia się w:
Fundamenta Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The class number one problem for the dihedral and dicyclic CM-fields
Autorzy:
Louboutin, Stéphane
Powiązania:
https://bibliotekanauki.pl/articles/965863.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
relative class number
CM-field
dihedral group
dicyclic group
Opis:
We recall the determination of all the dihedral CM-fields with relative class number one, and prove that dicyclic CM-fields have relative class numbers greater than one.
Źródło:
Colloquium Mathematicum; 1999, 80, 2; 259-265
0010-1354
Pojawia się w:
Colloquium Mathematicum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Homology of braid groups and their generalizations
Autorzy:
Vershinin, Vladimir
Powiązania:
https://bibliotekanauki.pl/articles/1342456.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
generalized braid group
configuration space
homology
Eilenberg-MacLane spectrum
Braid group
Coxeter group
Thom spectrum
Opis:
In the paper we give a survey of (co)homologies of braid groups and groups connected with them. Among these groups are pure braid groups and generalized braid groups. We present explicit formulations of some theorems of V. I. Arnold, E. Brieskorn, D. B. Fuks, F. Cohen, V. V. Goryunov and others. The ideas of some proofs are outlined. As an application of (co)homologies of braid groups we study the Thom spectra of these groups.
Źródło:
Banach Center Publications; 1998, 42, 1; 421-446
0137-6934
Pojawia się w:
Banach Center Publications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A relatively free topological group that is not varietal free
Autorzy:
Pestov, Vladimir
Shakhmatov, Dmitri
Powiązania:
https://bibliotekanauki.pl/articles/966051.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
relatively free topological group
variety of topological groups
free zero-dimensional topological group
varietal free topological group
Opis:
Answering a 1982 question of Sidney A. Morris, we construct a topological group G and a subspace X such that (i) G is algebraically free over X, (ii) G is relatively free over X, that is, every continuous mapping from X to G extends to a unique continuous endomorphism of G, and (iii) G is not a varietal free topological group on X in any variety of topological groups.
Źródło:
Colloquium Mathematicum; 1998, 77, 1; 1-8
0010-1354
Pojawia się w:
Colloquium Mathematicum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new proof of a theorem of Balcerzyk, Białynicki-Birula and Łoś
Autorzy:
O'Neill, John
Powiązania:
https://bibliotekanauki.pl/articles/966849.pdf
Data publikacji:
1996
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
measurable cardinal number
abelian group
torsion-free
direct product
slender group
Źródło:
Colloquium Mathematicum; 1996, 70, 2; 191-194
0010-1354
Pojawia się w:
Colloquium Mathematicum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A topological version of Bertinis theorem
Autorzy:
Piękosz, Artur
Powiązania:
https://bibliotekanauki.pl/articles/1311584.pdf
Data publikacji:
1995
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
fundamental group
branched covering
Opis:
We give a topological version of a Bertini type theorem due to Abhyankar. A new definition of a branched covering is given. If the restriction $π_V: V → Y$ of the natural projection π: Y × Z → Y to a closed set V ⊂ Y × Z is a branched covering then, under certain assumptions, we can obtain generators of the fundamental group π₁((Y×Z)\V).
Źródło:
Annales Polonici Mathematici; 1995, 61, 1; 89-93
0066-2216
Pojawia się w:
Annales Polonici Mathematici
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Topological realization of a family of pseudoreflection groups
Autorzy:
Notbohm, Dietrich
Powiązania:
https://bibliotekanauki.pl/articles/1205400.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
pseudoreflection groups
p-compact group
classifying spaces
compact Lie group
polynomial algebra
Opis:
We are interested in a topological realization of a family of pseudoreflection groups $G ⊂ GL(n,{\sym F}_p )$; i.e. we are looking for topological spaces whose mod-p cohomology is isomorphic to the ring of invariants ${\sym F}_p [x_1,..., x_n]^G$. Spaces of this type give partial answers to a problem of Steenrod, namely which polynomial algebras over ${\sym F}_p $ can appear as the mod-p cohomology of a space. The family under consideration is given by pseudoreflection groups which are subgroups of the wreath product $ℤ/q ≀Σ_n$ where q divides p - 1 and where p is odd. Let G be such a subgroup acting on the polynomial algebra $A:= {\sym F}_p [x_1,..., x_n]$. We show that there exists a space X such that $H*(X;{\sym F}_p )≅ A^G$ which is again a polynomial algebra. Examples of polynomial algebras of this form are given by the mod-p cohomology of the classifying spaces of special orthogonal groups or of symplectic groups.
 The construction uses products of classifying spaces of unitary groups as building blocks which are glued together via information encoded in a full subcategory of the orbit category of the group G. Using this construction we also show that the homotopy type of the p-adic completion of these spaces is completely determined by the mod-p cohomology considered as an algebra over the Steenrod algebra. Moreover, we calculate the set of homotopy classes of self maps of the completed spaces.
Źródło:
Fundamenta Mathematicae; 1998, 155, 1; 1-31
0016-2736
Pojawia się w:
Fundamenta Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some remarks on quantum and braided group gauge theory
Autorzy:
Majid, Shahn
Powiązania:
https://bibliotekanauki.pl/articles/1342806.pdf
Data publikacji:
1997
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
bosonisation
gauge theory
connection
braided group
quantum group
fiber bundle
noncommutative geometry
Opis:
We clarify some aspects of quantum group gauge theory and its recent generalisations (by T. Brzeziński and the author) to braided group gauge theory and coalgebra gauge theory. We outline the diagrammatic version of the braided case. The bosonisation of any braided group provides us a trivial principal bundle in three ways.
Źródło:
Banach Center Publications; 1997, 40, 1; 335-349
0137-6934
Pojawia się w:
Banach Center Publications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A spectral theory for locally compact abelian groups of automorphisms of commutative Banach algebras
Autorzy:
Zhong Huang, Sen
Powiązania:
https://bibliotekanauki.pl/articles/1217351.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
automorphism
group representation
spectral analysis
Opis:
Let A be a commutative Banach algebra with Gelfand space ∆ (A). Denote by Aut (A) the group of all continuous automorphisms of A. Consider a σ(A,∆(A))-continuous group representation α:G → Aut(A) of a locally compact abelian group G by automorphisms of A. For each a ∈ A and φ ∈ ∆(A), the function $φ_a(t):=φ(α_t a)$ t ∈ G is in the space C(G) of all continuous and bounded functions on G. The weak-star spectrum $σ_w*(φ_a)$ is defined as a closed subset of the dual group Ĝ of G. For φ ∈ ∆(A) we define $Ʌ_φ^a$ to be the union of all sets $σ_w*(φ_a)$ where a ∈ A, and $Λ_α$ to be the closure of the union of all sets $Ʌ_φ^a$ where φ ∈ ∆(A), and call $Λ_α$ the unitary spectrum of α. Starting by showing that the closure of $Ʌ_φ^a$ (for fixed φ ∈ ∆(A)) is a subsemigroup of Ĝ we characterize the structure properties of the group representation α such as norm continuity, growth and existence of non-trivial invariant subspaces through its unitary spectrum $Λ_α.$ For an automorphism T of a semisimple commutative Banach algebra A we consider the group representation T: ℤ → Aut (A) defined by $T_n:=T^n$ for all n ∈ ℤ. It is shown that $Λ_T=σ(T)∩$, where σ(T) is the spectrum of T and is the unit circle. From this fact we give an easy proof of the Kamowitz-Scheinberg theorem which asserts that the spectrum σ(T) either contains or is a finite union of finite subgroups of .
Źródło:
Studia Mathematica; 1999, 132, 1; 37-69
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quotients of toric varieties by actions of subtori
Autorzy:
Święcicka, Joanna
Powiązania:
https://bibliotekanauki.pl/articles/965980.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
group actions
quotients
orbit spaces
Opis:
Let X be an algebraic toric variety with respect to an action of an algebraic torus S. Let Σ be the corresponding fan. The aim of this paper is to investigate open subsets of X with a good quotient by the (induced) action of a subtorus T ⊂ S. It turns out that it is enough to consider open S-invariant subsets of X with a good quotient by T. These subsets can be described by subfans of Σ. We give a description of such subfans and also a description of fans corresponding to quotient varieties. Moreover, we give conditions for a subfan to define an open subset with a complete quotient space.
Źródło:
Colloquium Mathematicum; 1999, 82, 1; 105-116
0010-1354
Pojawia się w:
Colloquium Mathematicum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wildness in the product groups
Autorzy:
Hjorth, G.
Powiązania:
https://bibliotekanauki.pl/articles/1205068.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
group actions
Polish groups
group trees
product groups
permutation groups
Borel equivalence relations
Opis:
Non-abelian Polish groups arising as countable products of countable groups can be tame in arbitrarily complicated ways. This contrasts with some results of Solecki who revealed a very different picture in the abelian case.
Źródło:
Fundamenta Mathematicae; 2000, 164, 1; 1-33
0016-2736
Pojawia się w:
Fundamenta Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The *-holonomy group of the Stefan suspension of a diffeomorphism
Autorzy:
Piątkowski, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/1311817.pdf
Data publikacji:
1993
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
Stefan foliation
suspension
holonomy group
Opis:
The definition of a Stefan suspension of a diffeomorphism is given. If $_g$ is the Stefan suspension of the diffeomorphism g over a Stefan foliation , and G₀ ∈ satisfies the condition $g|G₀ = id_{G₀}$, then we compute the *-holonomy group for the leaf $F₀ ∈ _g$ determined by G₀. A representative element of the *-holonomy along the standard imbedding of S¹ into F₀ is characterized. A corollary for the case when G₀ contains only one point is derived.
Źródło:
Annales Polonici Mathematici; 1993, 58, 2; 123-129
0066-2216
Pojawia się w:
Annales Polonici Mathematici
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Knot manifolds with isomorphic spines
Autorzy:
Cavicchioli, Alberto
Hegenbarth, Friedrich
Powiązania:
https://bibliotekanauki.pl/articles/1208491.pdf
Data publikacji:
1994
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
3-manifold
spine
group presentation
Heegaard diagram
knot
knot group
knot manifold
peripheral system
Opis:
We study the relation between the concept of spine and the representation of orientable bordered 3-manifolds by Heegaard diagrams. As a consequence, we show that composing invertible non-amphicheiral knots yields examples of topologically different knot manifolds with isomorphic spines. These results are related to some questions listed in [9], [11] and recover the main theorem of [10] as a corollary. Finally, an application concerning knot manifolds of composite knots with h prime factors completes the paper.
Źródło:
Fundamenta Mathematicae; 1994, 145, 1; 79-89
0016-2736
Pojawia się w:
Fundamenta Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł

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