Results 131 to 140 of about 409,873 (273)

Isotropic Curvature and the Ricci Flow [PDF]

open access: yesInternational Mathematics Research Notices, 2009
In this paper, we study the Ricci flow on higher dimensional compact manifolds. We prove that nonnegative isotropic curvature is preserved by the Ricci flow in dimensions greater than or equal to four. In order to do so, we introduce a new technique to prove that curvature functions defined on the orthonormal frame bundle are preserved by the Ricci ...
openaire   +4 more sources

Laminaria digitata Extract Improved Leaf Meristem Protection Under Drought and Nitrogen Uptake After Rehydration Through Hormesis‐Based Chemical Priming in Lolium perenne

open access: yesPlant, Cell &Environment, Volume 48, Issue 9, Page 6674-6690, September 2025.
ABSTRACT Drought is among the most damaging stress for plants, impacting crop yield and grassland sustainability. This study aimed to evaluate the biostimulant effect of an algal extract from Laminaria digitata on Lolium perenne cultivated in a growth chamber. Leaves were sprayed at different concentrations 7 days before stopping irrigation.
Antoine Grandin‐Courbet   +4 more
wiley   +1 more source

Curvature estimates for the Ricci flow I [PDF]

open access: yesCalculus of Variations and Partial Differential Equations, 2007
In this paper we present several curvature estimates and convergence results for solutions of the Ricci flow. The curvature estimates depend on smallness of certain local space-time integrals of the norm of the Riemann curvature tensor, while the convergence results require finiteness of space-time integrals of the norm of the Riemann curvature tensor.
openaire   +4 more sources

k-Almost Newton-Conformal Ricci Solitons on Hypersurfaces Within Golden Riemannian Manifolds with Constant Golden Sectional Curvature

open access: yesAxioms
The current work establishes the geometrical bearing for hypersurfaces in a Golden Riemannian manifold with constant golden sectional curvature with respect to k-almost Newton-conformal Ricci solitons.
Amit Kumar Rai   +5 more
doaj   +1 more source

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