Classification of Veronesean caps
نویسندگان
چکیده
منابع مشابه
Quadric Veronesean Caps
In [2], a characterization theorem for Veronesean caps in PG(N,K), with K a skewfield, is provided. This result extends the theorem for the finite case proved in [7]. Although the statement of this theorem is correct, the proof given in [2] is incomplete, as some lemmas from [7] are proved using counting arguments and hence require a different approach in the infinite case. In this paper we use...
متن کاملHermitian Veronesean Caps
In [4], a characterization theorem for Veronesean varieties in PG(N,K), with K a skewfield, is proved. This result extends the theorem for the finite case proved in [6]. In this paper, we prove analogous results for Hermitian varieties, extending the results obtained in the finite case in [1] in a non-trivial way.
متن کاملCAPS-DB: a structural classification of helix-capping motifs
The regions of the polypeptide chain immediately preceding or following an α-helix are known as Nt- and Ct cappings, respectively. Cappings play a central role stabilizing α-helices due to lack of intrahelical hydrogen bonds in the first and last turn. Sequence patterns of amino acid type preferences have been derived for cappings but the structural motifs associated to them are still unclassif...
متن کاملGeneralized lax Veronesean embeddings of projective spaces
We classify all embeddings θ : PG(n,K) −→ PG(d,F), with d ≥ n(n+3) 2 and K,F skew fields with |K| > 2, such that θ maps the set of points of each line of PG(n,K) to a set of coplanar points of PG(d,F), and such that the image of θ generates PG(d,F). It turns out that d = 12n(n+ 3) and all examples “essentially” arise from a similar “full” embedding θ′ : PG(n,K) −→ PG(d,K) by identifying K with ...
متن کاملVeronesean Almost Binomial Almost Complete Intersections
The second Veronese ideal In contains a natural complete intersection Jn generated by the principal 2-minors of a symmetric (n× n)-matrix. We determine subintersections of the primary decomposition of Jn where one intersectand is omitted. If In is omitted, the result is the other end of a complete intersection link as in liaison theory. These subintersections also yield interesting insights int...
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: Discrete Mathematics
سال: 2008
ISSN: 0012-365X
DOI: 10.1016/j.disc.2006.11.042