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Abstract
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Let
be a Borel
subgroup of
and
a maximal torus
contained in .
Then
acts on
and every Schubert
variety is
-invariant.
We say that a Schubert variety is of complexity
if a maximal
-orbit
in has
codimension .
We discuss topology, geometry, and combinatorics related to Schubert varieties of
complexity one.
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Keywords
Schubert varieties, torus action, pattern avoidance, flag
Bott–Samelson varieties, flag Bott manifolds
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Mathematical Subject Classification
Primary: 14M15, 14M25
Secondary: 05A05
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Milestones
Received: 8 October 2020
Revised: 16 July 2021
Accepted: 11 October 2021
Published: 19 January 2022
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