منابع مشابه
On descent for coalgebras and type transformations
We find a criterion for a morphism of coalgebras over a Barr-exact category to be effective descent and determine (effective) descent morphisms for coalgebras over toposes in some cases. Also, we study some exactness properties of endofunctors of arbitrary categories in connection with natural transformations between them as well as those of functors that these transformations induce between co...
متن کاملComparing K-theories for Complex Varieties
The semi-topological K-theory of a complex variety was defined in [FW2] with the expectation that it would prove to be a theory lying “part way” between the algebraic K-theory of the variety and the topological K-theory of the associated analytic space, and thus would share properties with each of these other theories. In this paper, we realize these expectations by proving among other results ...
متن کاملA Descent Theorem in Topological K-Theory
4. Strategy of the proof. The first step is to remark the following basic fact : if Y is the product X x X with the action of G switching the factors, Y may be identified with the space of maps from EG to X, a space which is homotopically equivalent to X, since EG is contractible. 1This theorem is well known if A is the Banach algebra of real numbers : cf. [2], lemma 3.5 for instance. Other pro...
متن کاملBrane Descent Relations in K - theory
The various descent and duality relations among BPS and non-BPS D-branes are classified using topological K-theory. It is shown how the descent procedures for producing type-II D-branes from brane-antibrane bound states by tachyon condensation and (−1)L projections arise as natural homomorphisms of K-groups generating the brane charges. The transformations are generalized to type-I theories and...
متن کاملBrane Descent Relations in K - theory Kasper
The various descent and duality relations among BPS and non-BPS D-branes are classified using topological K-theory. It is shown how the descent procedures for producing type-II D-branes from brane-antibrane bound states by tachyon condensation and (−1)L projections arise as natural homomorphisms of K-groups generating the brane charges. The transformations are generalized to type-I theories and...
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ژورنال
عنوان ژورنال: Journal of Pure and Applied Algebra
سال: 2006
ISSN: 0022-4049
DOI: 10.1016/j.jpaa.2005.06.019