Polynomially determined tolerances
نویسندگان
چکیده
منابع مشابه
Rough sets determined by tolerances
We show that for any tolerance R on U , the ordered sets of lower and upper rough approximations determined by R form ortholattices. These ortholattices are completely distributive, thus forming atomistic Boolean lattices, if and only if R is induced by an irredundant covering of U , and in such a case, the atoms of these Boolean lattices are described. We prove that the ordered set RS of rough...
متن کاملPolynomially Unbounded Product of Two Polynomially Bounded Operators
where S is a unilateral forward shift of infinite multiplicity, S∗ is its adjoint, and Yα is a matrix (αi+jCi+j ), with {αk}k∈N a sequence of complex numbers, and {Ck}k∈N a family of operators satisfying the “canonical anticommutation relations”. We exhibit a sequence {αk} such that T is polynomially bounded but T⊗T is not. This shows that the product of two commuting polynomially bounded opera...
متن کاملPolynomially parsable unification grammars
Unification grammars (UG) are a grammatical formalism that underlies several contemporary linguistic theories, including Lexical-functional Grammar and Head-driven Phrase-structure Grammar. UG is an especially attractive formalism because of its expressivity, which facilitates the expression of complex linguistic structures and relations. Formally, UG is Turing-complete, generating the entire c...
متن کاملPolynomially bounded C0-semigroups
We characterize generators of polynomially bounded C0-semigroups in terms of an integrability condition for the second power of the resolvent on vertical lines. This generalizes results by Gomilko, Shi and Feng on bounded semigroups and by Malejki on polynomially bounded groups.
متن کاملPolynomially Convex Sets
I. Local descriptions of the hulls. To begin, we explain what we mean by a curve of analytic hypersurfaces in an open subset, 0, of C. If U is a domain in O and Ft, 0 St < 1, is a curve of nonconstant analytic functions on £7, we let Ht be the zero-set of Ft in U. If each Ht is closed in 0, then we say that (Ftl Ht) is a curve of analytic hypersurfaces in O. We shall denote it, simply, by (Ht)....
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: Czechoslovak Mathematical Journal
سال: 1980
ISSN: 0011-4642,1572-9141
DOI: 10.21136/cmj.1980.101695