The paper specifies and estimates a production function for the airline industry, identifying firms' network characteristics and efficiency as the main determinants of their productivity. The application of this analysis to the European market shows that productivity differences among flag carriers could explain the governments' different views about deregulation at the beginning of the eightie...

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. We give two expressions for the induced map on cohomology. One is in terms of generators and the other is in terms of the Schubert basis. We show that the coefficients in t...

Horn recursion is a term used to describe when non-vanishing products of Schubert classes in the cohomology of flag varieties G/P are characterized by inequalities parameterized by similar non-vanishing products in the cohomology of “smaller” flag varieties. We consider the partial flag variety SLn/P and find that H ∗(SLn/P ) exhibits Horn recursion on a certain deformation of the cup product. ...

This paper defines for each object X that can be constructed out of a finite number of vertices and cells a vector f X lying in a finite dimensional vector space. This is the flag vector of X. It is hoped that the quantum topological invariants of a manifold M can be expressed as linear functions of the flag vector of the i-graph that arises from any suitable triangulation T of M. Flag vectors ...

We first review the description of flag manifolds in terms of Plücker coordinates and coherent states. Using this description, we construct fuzzy versions of the algebra of functions on these spaces in both operatorial and star product language. Our main focus is here on flag manifolds appearing in the double fibration underlying the most common twistor correspondences. After extending the Plüc...

we prove that every r-quadratic metric of scalar flag curvature with a dimension greater than twois of constant flag curvature. then we show that generalized douglas-weyl metrics contain r-quadraticmetrics as a special case, but the class of r-quadratic metric is not closed under projective transformations

Let G be a semisimple simply connected algebraic group over an algebraically closed field of characteristic 0. Let V be a simple finite-dimensional G-module and let y be its highest weight vector. It is a classical result of B. Kostant that the algebra of functions on the closure of G · y is quadratic. In this paper we generalize this result to the case of the quantum group Uq(g). The proof use...

One source major of email addresses for spammers involves “harvesting” them from websites. This paper describes a proposal to allow a website owner to make illegal such automated extraction of email addresses. We propose a “no-email-collection” standard for websites and a mechanism to track spammers violating the standard. There are four parts to this proposal. The first part is to create speci...

The French flag model represents how embryonic cells receive and respond to genetic information and subsequently differentiate into patterns. Created by Lewis Wolpert [5] in the late 1960?s, the model uses the French tricolor flag as visual representation to show how embryonic cells can interpret genetic code to create the same pattern even when certain pieces of the embryo are removed. Wolpert...