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A note on homotopy and pseudoisotopy of diffeomorphisms of $4$-manifolds

open access: yesComptes Rendus. Mathématique
This note serves to record examples of diffeomorphisms of closed smooth $4$-manifolds $X$ that are homotopic but not pseudoisotopic to the identity, and to explain why there are no such examples when $X$ is orientable and its fundamental group is a free ...
Krannich, Manuel, Kupers, Alexander
doaj   +1 more source

INDEX COMPUTATION OF SOME BISINGULAR OPERATORS WITH SHIFT BY HOMOTOPY METHOD

open access: yesAdvanced Engineering Research, 2010
The work continues to research the insufficiently explored problem of bisingular operators with shift index. It considers new cases of index computation of the bisingular operators with indisintegrative involutive shift by the homotopy method.
S. V. EFIMOV
doaj  

ABSTRACT HOMOTOPY [PDF]

open access: yesProceedings of the National Academy of Sciences, 1955
openaire   +2 more sources

Continuos g-contraíbles

open access: yesRevista Integración, 2012
Diremos que un continuo X es g-contraíble si existe una función continua y sobreyectiva f : X → X que es homotópica a una función constante. En este artículo hacemos una recopilación de los resultados conocidos acerca de los continuos g-contraíbles ...
Michael A. Rincón-Villamizar
doaj  

Travelling wave solutions: A new approach to the analysis of nonlinear physical phenomena

open access: yesOpen Physics, 2014
Sayevand Khosro   +2 more
doaj   +1 more source

Torus Homotopy Groups [PDF]

open access: yesProceedings of the National Academy of Sciences, 1945
openaire   +3 more sources

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