Now showing items 1-10 of 924
Presentation complexes with the fixed point property
(Mathematical Sciences Publishers, 2017-03)
We prove that there exists a compact two-dimensional polyhedron with the fixed point property and even Euler characteristic. This answers a question posed by R H Bing in 1969. We also settle a second question by Bing ...
Strong surjectivity of maps from 2-complexes into the 2-sphere
Given a model 2-complex K(P) of a group presentation P, we associate to it an integer matrix Delta(P) and we prove that a cellular map f : K(P) -> S(2) is root free (is not strongly surjective) if and only if the diophantine ...
On a question of R.H. Bing concerning the fixed point property for two-dimensional polyhedra
(Academic Press Inc Elsevier Science, 2017-01)
In 1969 R.H. Bing asked the following question: Is there a compact two-dimensional polyhedron with the fixed point property which has even Euler characteristic? In this paper we prove that there are no spaces with these ...
The role of finite hole mass in the negatively charged exciton in two dimensions
(Elsevier Science BvAmsterdamHolanda, 2001)
Discriminating image textures with the multiscale two-dimensional complexity-entropy causality plane
(Pergamon-Elsevier Science Ltd, 2016-10)
The aim of this paper is to further explore the usefulness of the two-dimensional complexity-entropy causality plane as a texture image descriptor. A multiscale generalization is introduced in order to distinguish between ...
Unitary transformations of a family of two-dimensional anharmonic oscillators
In this paper we analyze a recent application of perturbation theory by the moment method to a family of two-dimensional anharmonic oscillators. By means of straightforward unitary transformations we show that two of the ...
Two-Point Function at Two Loops via Triangle Diagram Insertion
(Physical Soc Japan, 2012-04-01)
In this work we calculate in two different ways a well-known two-point two-loop massless Feynman diagram to illustrate the feasibility of lgluing'' that is, inserting or embedding-simpler diagrams into more complex ones, ...