On projective surfaces arising from an adjunction process
نویسندگان
چکیده
منابع مشابه
An Adjunction for Modules over Projective Schemes
For modules over a ring there is an adjunction between the associated sheaf functor AMod −→ Mod(SpecA) and the global sections functor Mod(SpecA) −→ AMod. In this note we develop the graded version of this result. All of this material is taken from EGA.
متن کاملOn regular graphs of girth six arising from projective planes
In 1967, Brown constructed small k-regular graphs of girth six as induced subgraphs of the incidence graph of a projective plane of order q, q ≥ k. Examining the construction method, we prove that starting from PG(2, q), q = p, p prime, there are no other constructions using this idea resulting in a (q + 1− t)-regular graph of girth six than the known ones, if t is not too large (t ≤ p and roug...
متن کاملON (k, 6)-GRAPHS ARISING FROM PROJECTIVE PLANES
We study a construction method (first used in a paper by Brown [7] and having been rediscovered by several authors recently) producing small (k, 6)-graphs. We prove that under some conditions the known constructions are best possible in the sense that one cannot hope for smaller examples from this method. Both algebraic and combinatorial tools are used.
متن کاملFoliations on Complex Projective Surfaces
In this text we shall review the classification of foliations on complex projective surfaces according to their Kodaira dimension, following McQuillan’s seminal paper [MQ1] with some complements and variations given by [Br1] and [Br2]. Most of the proofs will be only sketched, and the text should be considered as guidelines to the above works (and related ones), with no exhaustivity nor selfcon...
متن کاملOn non-projective normal surfaces
In this note we construct examples of non-projective normal proper algebraic surfaces and discuss the somewhat pathological behaviour of their Neron-Severi group. Our surfaces are birational to the product of a projective line and a curve of higher genus.
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: Japanese journal of mathematics. New series
سال: 1991
ISSN: 0289-2316,1861-3624
DOI: 10.4099/math1924.17.285