On a problem of S. Ulam concerning Cartesian squares of 2-dimensional polyhedra
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Displaying 1 – 20 of 20
On aspherical presentations of groups.
Ivanov, Sergei V. (1998)
Electronic Research Announcements of the American Mathematical Society [electronic only]
On Cartesian powers of 2-polyhedra
Witold Rosicki (1990)
Colloquium Mathematicae
On decomposition of 3-polyhedra into a Cartesian product
Witold Rosicki (1990)
Fundamenta Mathematicae
On equivariant deformations of maps.
Antonio Vidal (1988)
Publicacions Matemàtiques
We work in the smooth category: manifolds and maps are meant to be smooth. Let G be a finite group acting on a connected closed manifold X and f an equivariant self-map on X with f|A fixpointfree, where A is a closed invariant submanifold of X with codim A ≥ 3. The purpose of this paper is to give a proof using obstruction theory of the following fact: If X is simply connected and the action of G on X - A is free, then f is equivariantly deformable rel. A to fixed point free map if and only if the...
On framed links of Peiffer identities
Tomasz Bortnik (1987)
Colloquium Mathematicae
On general dissections of a polygon.
Ronald C. Read (1978)
Aequationes mathematicae
On general dissections of a polygon. (Short Communication).
Ronald C. Read (1978)
Aequationes mathematicae
On homotopy types of 2-dimensional polyhedra
Karol Borsuk, Anna Gmurczyk (1980)
Fundamenta Mathematicae
On J.H.C. Whitehead's aspherical question I.
Joe Brandenburg, M. Dyer (1981)
Commentarii mathematici Helvetici
On small geometric invariants of 3-manifolds.
Kapitza, Paul J. (2011)
The New York Journal of Mathematics [electronic only]
On the absolute value of the SO(3)-invariant and other summands of the Turaev-Viro invariant
Maxim Sokolov (1998)
Banach Center Publications
On the boundary of 2-dimensional ideal polyhedra
Emmanuel Vrontakis (2006)
Commentationes Mathematicae Universitatis Carolinae
It is proved that for every two points in the visual boundary of the universal covering of a -dimensional ideal polyhedron, there is an infinity of paths joining them.
On the dimension of 2-dimensional Bestvina-Brady groups.
Crisp, John (2002)
Algebraic & Geometric Topology
On the connectivity of skeletons of pseudomanifolds with boundary
R. Ayala, M. J. Chávez, Alberto Márquez, Antonio Quintero (2002)
Mathematica Bohemica
In this note we show that -skeletons and -skeletons of -pseudomanifolds with full boundary are -connected graphs and -connected -complexes, respectively. This generalizes previous results due to Barnette and Woon.
On the Homeotopy Groups of Surfaces.
Heiner Zieschang (1973)
Mathematische Annalen
On the planarity of 2-complexes
Frank Harary, Ronald H. Rosen (1976)
Colloquium Mathematicae
On the Space of the Linear Homeomorphisms of a Polyhedral TV-Cell with Two Interior Vertices*.
Chung-wu Ho (1979)
Mathematische Annalen
One-relator groups and proper 3-realizability.
M. Cárdenas, F.F. Lasheras, A. Quintero, D. Repovs (2009)
Revista Matemática Iberoamericana
Optics in Croke-Kleiner Spaces
Fredric D. Ancel, Julia M. Wilson (2010)
Bulletin of the Polish Academy of Sciences. Mathematics
We explore the interior geometry of the CAT(0) spaces , constructed by Croke and Kleiner [Topology 39 (2000)]. In particular, we describe a diffraction effect experienced by the family of geodesic rays that emanate from a basepoint and pass through a certain singular point called a triple point, and we describe the shadow this family casts on the boundary. This diffraction effect is codified in the Transformation Rules stated in Section 3 of this paper. The Transformation Rules have various applications....
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