منابع مشابه
The Computation of Invariant Fields and a new Proof of a Theorem by Rosenlicht
Let G be an algebraic group acting on an irreducible variety X. We present an algorithm for computing the invariant field k(X). This algorithm leads to a new, constructive proof of a theorem of Rosenlicht, which says that almost all orbits can be separated by rational invariants.
متن کاملOn a Dynamical Version of a Theorem of Rosenlicht
Consider the action of an algebraic group G on an irreducible algebraic variety X all defined over a field k. M. Rosenlicht showed that orbits in general position in X can be separated by rational invariants. We prove a dynamical analogue of this theorem, where G is replaced by a semigroup of dominant rational maps X 99K X. Our semigroup G is not required to have the structure of an algebraic v...
متن کاملDifferentiation along Multivector Fields
The Lie derivation of multivector fields along multivector fields has been introduced by Schouten (see cite{Sc, S}), and studdied for example in cite{M} and cite{I}. In the present paper we define the Lie derivation of differential forms along multivector fields, and we extend this concept to covariant derivation on tangent bundles and vector bundles, and find natural relations between them and...
متن کاملA message from the American College of Oral and Maxillofacial Surgeons President-Elect, Joel L. Rosenlicht, DMD.
There is no question that we are embarking on changing times in our specialty. For more than 30 years the American College of Oral and Maxillofacial Surgeons has been at the forefront of change, expanding our scope and redefining who and what oral surgeons are and do. In fact, it was the American College of Oral and Maxillofacial Surgeons that initiated our name change to oral and maxillofacial...
متن کاملconstruction of vector fields with positive lyapunov exponents
in this thesis our aim is to construct vector field in r3 for which the corresponding one-dimensional maps have certain discontinuities. two kinds of vector fields are considered, the first the lorenz vector field, and the second originally introced here. the latter have chaotic behavior and motivate a class of one-parameter families of maps which have positive lyapunov exponents for an open in...
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ژورنال
عنوان ژورنال: Transactions of the American Mathematical Society
سال: 1993
ISSN: 0002-9947
DOI: 10.2307/2154395