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APAL
2006
57views more  APAL 2006»
13 years 10 months ago
Effective categoricity of equivalence structures
We investigate effective categoricity of computable equivalence structures A. We show that A is computably categorical if and only if A has only finitely many finite equivalence c...
Wesley Calvert, Douglas Cenzer, Valentina S. Hariz...
DLT
2006
13 years 11 months ago
On Critical Exponents in Fixed Points of Non-erasing Morphisms
Let be an alphabet of size t, let f : be a non-erasing morphism, let w be an infinite fixed point of f, and let E(w) be the critical exponent of w. We prove that if E(w) is fi...
Dalia Krieger
SYNTHESE
2008
83views more  SYNTHESE 2008»
13 years 9 months ago
A relativistic Zeno effect
A Zenonian supertask involving an infinite number of identical colliding balls is generalized to include balls with different masses. Under the restriction that the total mass of a...
David Atkinson
PODS
2004
ACM
139views Database» more  PODS 2004»
14 years 10 months ago
On Preservation under Homomorphisms and Unions of Conjunctive Queries
Unions of conjunctive queries, also known as select-project-join-union queries, are the most frequently asked queries in relational database systems. These queries are definable b...
Albert Atserias, Anuj Dawar, Phokion G. Kolaitis
STOC
2002
ACM
112views Algorithms» more  STOC 2002»
14 years 10 months ago
Wait-free consensus with infinite arrivals
A randomized algorithm is given that solves the wait-free consensus problem for a shared-memory model with infinitely many processes. The algorithm is based on a weak shared coin ...
James Aspnes, Gauri Shah, Jatin Shah