منابع مشابه
On Positive Relational Calculi
We discuss the question of inclusions between positive relational terms and some of its aspects, using the form of a dialogue. Two possible approaches to the problem are emphasized: natural deduction and graph manipulations. Both provide sound and complete calculi for proving the valid inclusions, supporting nice strategies to obtain proofs in normal form, but the latter appears to present seve...
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It has been noted that a low degree of ectopia of the cerebellar tonsils on MR is of questionable significance. We measured the position of the cerebellar tonsils with respect to the inferior aspect of the foramen magnum in 200 normal patients and in 25 patients with a firm diagnosis of Chiari I malformation. In the normal group, the mean position of the tonsils was 1 mm above the foramen magnu...
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A 16 year old women with Tangier disease in palatine tonsils is reported. She has recurrent sore throat. In physical examination the palatine tonsils are hypertrophied and has very yellowish points. The facial skin is yellowish the skin of another areas of body is normal. After tonsillectomy the pathologist report Tangier disease in palatine tonsils.
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Quantified Boolean formulas (QBFs) generalize propositional formulas by admitting quantifications over propositional variables. QBFs can be viewed as (restricted) formulas of first-order predicate logic and easy translations of QBFs into first-order formulas exist. We analyze different translations and show that first-order resolution combined with such translations can polynomially simulate we...
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We introduce a category of noncommutative bundles. To establish geometry in this category we construct suitable noncommutative differential calculi on these bundles and study their basic properties. Furthermore we define the notion of a connection with respect to a differential calculus and consider questions of existence and uniqueness. At the end these constructions are applied to basic examp...
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ژورنال
عنوان ژورنال: BMJ
سال: 1899
ISSN: 0959-8138,1468-5833
DOI: 10.1136/bmj.1.1984.14