Results 21 to 30 of about 382 (39)

Projected Gromov-Witten varieties in cominuscule spaces

open access: yes, 2017
A projected Gromov-Witten variety is the union of all rational curves of fixed degree that meet two opposite Schubert varieties in a homogeneous space X = G/P.
Buch, Anders S.   +3 more
core   +2 more sources

Vanishing of Schubert coefficients via the effective Hilbert nullstellensatz

open access: yesForum of Mathematics, Sigma
Schubert Vanishing is a problem of deciding whether Schubert coefficients are zero. Until this work it was open whether this problem is in the polynomial hierarchy ${{\mathsf {PH}}}$ .
Igor Pak, Colleen Robichaux
doaj   +1 more source

Correspondences between projective planes [PDF]

open access: yes, 2014
We characterize integral homology classes of the product of two projective planes which are representable by a subvariety.Comment: Improved readability, 14 ...
Huh, June
core  

Topological transversals to a family of convex sets

open access: yes, 2010
Let $\mathcal F$ be a family of compact convex sets in $\mathbb R^d$.
H.L. Hiller   +17 more
core   +1 more source

Bondi Accretion in the Spherically Symmetric Johannsen-Psaltis Spacetime

open access: yes, 2019
The Johannsen-Psaltis spacetime explicitly violates the no hair theorem. It describes rotating black holes with scalar hair in the form of parametric deviations from the Kerr metric.
John, Anslyn, Stevens, Chris
core   +1 more source

Cohomological consequences of the pattern map [PDF]

open access: yes, 2014
Billey and Braden defined maps on flag manifolds that are the geometric counterpart of permutation patterns. A section of their pattern map is an embedding of the flag manifold of a Levi subgroup into the full flag manifold.
Adeyemo, Praise, Sottile, Frank
core  

Grassmann defectivity \`a la Terracini

open access: yes, 2001
This work is a modern revisitation of a classical paper by Alessandro Terracini, going back to 1915, which suggests an elementary but powerful method for studing Grassmann defective varieties.
Dionisi, Carla, Fontanari, Claudio
core  

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