Complex quotients by nonclosed groups and their stratifications

نویسنده

  • Fiammetta Battaglia
چکیده

We define the notion of complex stratification by quasifolds and show that such spaces occur as complex quotients by certain nonclosed subgroups of tori associated to convex polytopes. To each convex polytope, rational or not, there corresponds a whole family of these spaces, which provide a natural generalization of the notion of toric variety associated to a rational convex polytope. 2000 Mathematics Subject Classification. Primary: 14M25. Secondary: 53D20, 32S99, 32C15.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

A classification of hull operators in archimedean lattice-ordered groups with unit

The category, or class of algebras, in the title is denoted by $bf W$. A hull operator (ho) in $bf W$ is a reflection in the category consisting of $bf W$ objects with only essential embeddings as morphisms. The proper class of all of these is $bf hoW$. The bounded monocoreflection in $bf W$ is denoted $B$. We classify the ho's by their interaction with $B$ as follows. A ``word'' is a function ...

متن کامل

Affine stratifications from finite misère quotients

Given a morphism from an affine semigroup Q to an arbitrary commutative monoid, it is shown that every fiber possesses an affine stratification: a partition into a finite disjoint union of translates of normal affine semigroups. The proof rests on mesoprimary decomposition of monoid congruences and a novel list of equivalent conditions characterizing the existence of an affine stratification. T...

متن کامل

DISCRETE GROUPS AND THE COMPLEX CONTACT GEOMETRY OF Sl(2,C)

We investigate the vertical foliation of the standard complex contact structure on Γ \ Sl(2,C), where Γ is a discrete subgroup. We find that, if Γ is nonelementary, the vertical leaves on Γ \Sl(2,C) are holomorphic but not regular. However, if Γ is Kleinian, then Γ \ Sl(2,C) contains an open, dense set on which the vertical leaves are regular, complete and biholomorphic to C∗. If Γ is a uniform...

متن کامل

Cusps and D-modules

We study interactions between the categories of D-modules on smooth and singular varieties. For a large class of singular varieties Y , we use an extension of the Grothendieck–Sato formula to show that DY -modules are equivalent to stratifications on Y , and as a consequence are unaffected by a class of homeomorphisms, the cuspidal quotients. In particular, when Y has a smooth bijective normali...

متن کامل

Subanalytic Stratifications and Bisimulations

Decidability results for the veriication of hybrid systems consist of constructing special nite state quotients called bisimulations whose properties are equivalent to those of the original innnite state system. This approach has had success in the case of timed automata and linear hybrid automata. In this paper, the powerful framework of stratiication theory and subanalytic sets is presented a...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2008