𝔖 Bobbio Scriptorium
✦   LIBER   ✦

On the matroid stratification of Grassmann varieties, specialization of coordinates, and a problem of N. White

✍ Scribed by Bernd Sturmfels

Publisher
Elsevier Science
Year
1989
Tongue
English
Weight
506 KB
Volume
75
Category
Article
ISSN
0001-8708

No coin nor oath required. For personal study only.

✦ Synopsis

We resolve a problem of N. White [J. Combin. Theory Ser. B 29 (1980), 168-1751 by constructing representable matroids F and G with F< G in the weak map order such that no coordinatization of G specializes to a coordinatization of F. Our approach is based upon the interplay of combinatorics and topology in the matroid stratilication of the complex Grassmann variety G,,d introduced by 1. M. Gelfand, R. M. Goresky, R. D. MacPherson, and V. Serganova [Ado. in Math. 63 (1987) 301-3161. Related aspects and open problems in the algebraic geometry of matroids are discussed.

πŸ“œ SIMILAR VOLUMES

The effect of cooking and processing on
The effect of cooking and processing on the glucosinolate content: Studies on four varieties of portuguese cabbage and hybrid white cabbage
✍ Eduardo A S Rosa; Robert K Heaney πŸ“‚ Article πŸ“… 1993 πŸ› John Wiley and Sons 🌐 English βš– 675 KB

## Abstract The concentrations of individual and total glucosinolates were measured in four types of Portuguese cabbage and in one hybrid white cabbage before and after cooking. Typical Portuguese culinary procedures include boiling the cabbage for 10 min but for particular kale types the leaves ar

On the solution of the N-completeness pr
On the solution of the N-completeness problem
✍ E. S. Kryachko; Yu. A. Kruglyak πŸ“‚ Article πŸ“… 1976 πŸ› John Wiley and Sons 🌐 English βš– 186 KB

## Abstract A solution is given for the problem of __N__‐completeness which arises in practical calculations for many electron systems because of the necessity of employing a finite basis set of antisymmetric two‐particle functions.

The performance of a variety of density
The performance of a variety of density functional and ab initio methods on the structural problem of beryllium borohydride
✍ Agnes Derecskei-Kovacs; Dennis S. Marynick πŸ“‚ Article πŸ“… 1994 πŸ› Elsevier Science 🌐 English βš– 561 KB

The Dm and Dgd isomers of beryllium borohydride (BeB,Hs ) have been studied with different ab initio and density functional techniques. Optimized geometries were obtained with a polarized split valence basis set and electronic energies were calculated at the optimum geometry with an extended polariz