Some questions concerning reduced density operators are reviewed. A new proof of the condition for Fermionic N-representability of one-particle density operators is given which is based on the functional analytic method of the dual cone. The application of a quantum analog of de Finetti's theorem to
REDUCIBILITY IN SOME CATEGORIES OF PARTIAL RECURSIVE OPERATORS
β Scribed by Caterina Bianchini; Andrea Sorbi
- Publisher
- John Wiley and Sons
- Year
- 1992
- Tongue
- English
- Weight
- 609 KB
- Volume
- 38
- Category
- Article
- ISSN
- 0044-3050
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β¦ Synopsis
Abstract
We consider two categories with one object, namely the set of all partial functions of one variable from the set of natural numbers into itself; the morphisms are the partial recursive operators in one case, and certain continuous partial mappings in the other case. We show that these categories are recursion categories and we characterize the domains and the complete domains. Some observations are made on a notion of reducibility obtained by using the total morphisms of these categories, and, subsequently, the general recursive operators.
π SIMILAR VOLUMES
## Abstract Computable limits and colimits are βrecursive counterpartsβ of the suitable classical concepts from category theory. We present mainly some interesting problems related to computable products. Moreover, some βcomputable counterpartsβ of wellβknown classical facts from category theory ar