Twisting and Turning
نویسندگان
چکیده
منابع مشابه
Twisting and Turning in Space
ion and classification continues, What's Euclidean On a perfectly flat surface, parallel lines never meet. A triangle drawn on such a plane has interior angles that add up to 1800. A straight line is the shortest distance between two points. These and other postulates and results are part of the geometry first invented by Euclid more than 2,000 years ago. Later mathematicians refined and extend...
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The framework used to prove the multiplicative law deformation of the algebra of Feynman-Bender diagrams is a twisted shifted dual law (in fact, twice). We give here a clear interpretation of its two parameters. The crossing parameter is a deformation of the tensor structure whereas the superposition parameters is a perturbation of the shuffle coproduct of Hoffman type which, in turn, can be in...
متن کاملTwisting Cochains and Higher Torsion
This paper gives a short summary of the central role played by Ed Brown’s “twisting cochains” in higher FranzReidemeister (FR) torsion and higher analytic torsion. Briefly, any fiber bundle gives a twisting cochain which is unique up to fiberwise homotopy equivalence. However, when they are based, the difference between two of them is a higher algebraic K-theory class measured by higher FR tors...
متن کاملTwisting S-branes
Smooth time dependent supergravity solutions corresponding to analytic continuations of Kerr black holes are constructed and limits with a local de Sitter phase are found. These solutions are non-singular due to a helical twist in space and a fine tuning of the energy flow in the spacetime. For the extremal limit in which the mass and twist parameters are equal the S-brane undergoes de Sitter e...
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ژورنال
عنوان ژورنال: Mechanical Engineering
سال: 1999
ISSN: 0025-6501,1943-5649
DOI: 10.1115/1.1999-dec-6