منابع مشابه
Disjoint Edges in Geometric Graphs
A stract. Answering an old question in com inatorial geometry, we show that any configuration consisting of a set V of n points in general position in the plane and a set of 6n-5 closed straight line segments whose endpoints lie in V, contains three pairwise disjoint line segments. A geometric graph is a pair G=(V, E), where V is a set of points (=vertices) in general position in the plane, i ....
متن کاملGeometric Invariants of Fanning Curves
We study the geometry of an important class of generic curves in the Grassmann manifolds of n-dimensional subspaces and Lagrangian subspaces of IR under the action of the linear and linear symplectic groups. On préfère calculer plutôt que voir : c’est moins pénible et plus convaincant.
متن کاملDifferential Characters and Geometric Invariants
This paper first appeared in a collection of lecture notes which were distributed at the A.M.S. Summer Institute on Differential Geometry, held at Stanford in 1973. Since then it has been (and remains) the authors' intention to make available a more detailed version. But, in the mean time, we continued to receive requests for the original notes. Moreover, the secondary invariants we discussed h...
متن کاملLogo recognition using geometric invariants
The problem of logo recognition is of great interest in the document domain, especially for databases, because of its potential for identifying the source of the document and its generality as a recognition problem. By recognizing the logo we obtain semantic information about the document, which may be useful in deciding whether or not to analyze the textual components. In this paper, we presen...
متن کاملGeometric methods for cohomological invariants
We explain how to exploit Rost’s theory of Chow groups with coefficients to carry some computations of cohomological invariants. In particular, we use the idea of the “stratification method” introduced by Vezzosi. We recover a number of known results, with very different proofs. We obtain some new information on spin groups and on PGL4.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Canadian Journal of Mathematics
سال: 2016
ISSN: 0008-414X,1496-4279
DOI: 10.4153/cjm-2015-011-5