منابع مشابه
On the Putnam-Fuglede theorem
We extend the Putnam-Fuglede theorem and the second-degree Putnam-Fuglede theorem to the nonnormal operators and to an elementary operator under perturbation by quasinilpo-tents. Some asymptotic results are also given.
متن کاملNote on a Theorem of Putnam ' Smichael
In a 1981 book, H. Putnam claimed that in a pure relational language without equality, for any model of a relation that was neither empty nor full, there was another model that satisses the same rst order sentences. Ed Keenan observed that this was false for nite models since equality is a deenable predicate in such cases. This note shows that Putnam's claim is true for innnite models, although...
متن کاملNote on a Theorem of Fuglede and Putnam
1. An involution in a ring A is a mapping a—^a* (a(Ei;A) such that a**=a, (a+b)*=a*+b*, (ab)* = b*a*. An element a&A is (1) normal if a*a=aa*, (2) self-adjoint if a*=a, (3) unitary if a*a=aa* = l (1= unity element of A). We say that "Fuglede's theorem holds in A" incase the relations a(E.A, a normal, b^A, ba=ab, imply ba* = a*b; briefly, A is an FT-ring. It follows from a theorem of B. Fuglede ...
متن کاملOn Putnam
Hilary Putnam has made major contributions to philosophy of mind and philosophy of language. In philosophy of mind, he developed the theories of multiple instantiability and functionalism. In philosophy of language, a major contribution of his is semantic externalism. This paper will give a very brief overview of multiple instantiability and functionalism, and then describe semantic externalism...
متن کاملAn Improvement of the Beck-Fiala Theorem
In 1981 Beck and Fiala proved an upper bound for the discrepancy of a set system of degree d that is independent of the size of the ground set. In the intervening years the bound has been decreased from 2d− 2 to 2d− 4. We improve the bound to 2d− log∗ d. MSC classes: 05D05, 11K38, 05C15
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ژورنال
عنوان ژورنال: Bulletin of the Belgian Mathematical Society - Simon Stevin
سال: 2010
ISSN: 1370-1444
DOI: 10.36045/bbms/1290608198