Results 41 to 46 of about 233 (46)

Linking and causality in globally hyperbolic spacetimes

, 2006
The linking number $lk$ is defined if link components are zero homologous. Our affine linking invariant $alk$ generalizes $lk$ to the case of linked submanifolds with arbitrary homology classes.
A. Bernal, A. Bernal, A. Bernal, C. Biasi, H. Samelson, H.G. Seifert, J. Dieckmann, J. Milnor, J. Munkres, J. Natario, M. Freedman, R. Bott, R.J. Low, R.J. Low, R.J. Low, R.P. Geroch, S. Smale, S. Smale, S.L. Tabachnikov, T. Ekholm, V. Chernov (Tchernov), V.I. Arnold, Vladimir V. Chernov (Tchernov), Yuli B. Rudyak   +23 more
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Hurewicz theorem for Extension Dimension [PDF]

, 2002
We prove a new selection theorem for multivalued mappings of C-space. Using this theorem we prove extension dimensional version of Hurewicz theorem for a closed mapping f : X ?
Chigogidze, A. "Alex", NC DOCKS at The University of North Carolina at Greensboro   +1 more
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A Homotopy Theory of Orbispaces

, 2001
In 1985, physicists Dixon, Harvey, Vafa and Witten studied string theories on Calabi-Yau orbifolds (cf. [DHVW]). An interesting discovery in their paper was the prediction that a certain physicist's Euler number of the orbifold must be equal to the Euler
Chen, Weimin
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Stable homotopy groups of spheres. [PDF]

Proc Natl Acad Sci U S A, 2020
Isaksen DC, Wang G, Xu Z.
europepmc   +1 more source

Metrizable uniform spaces

, 2018
Three themes of general topology: quotient spaces; absolute retracts; and inverse limits - are reapproached here in the setting of metrizable uniform spaces, with an eye to applications in geometric and algebraic topology. The results include: 1) If f:
Melikhov, Sergey A.
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Some advancements on homogeneous spaces, star-covering properties and selection principles [PDF]

, 2023
MAESANO, Fortunato
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