7 Result(s)
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Uri Abraham
Mathematics, general
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Article
More results in polychromatic Ramsey theory
We study polychromatic Ramsey theory with a focus on colourings of [ω 2]2. We show that in the absence of GCH there is a wide range of possibilities. In particular each of the following is consist...
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Article
Infinite games on finite sets
We study a family of infinite games with imperfect information introduced by B. Model for two players that alternately remove and add points to a finite set. We investigate the existence of imperfect informati...
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Article
On Jakovlev spaces
A topological spaceX is called weakly first countable, if for every pointx there is a countable family {C n x |n ∈ω} such thatx ∈C ...
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Article
On a superatomic Boolean algebra which is not generated by a well-founded sublattice
Let b denote the unboundedness number of ωω. That is, b is the smallest cardinality of a subset \(F \subseteq \omega ^\omega \) ...
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Article
Martin's axiom and \(\Delta^2_1\) well-ordering of the reals
Assuming an inaccessible cardinal \(\kappa\) , there is a generic extension in which \(MA + 2^{\aleph_0} = \kappa\) holds and the reals have a
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Chapter and Conference Paper
On the limitation of the global time assumption in distributed systems
An ongoing debate among theoreticians of distributed systems concerns the global time issue. The basic question seems to be to what extent does a model with global time reflect the ‘real’ behavior of a distrib...
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Article
Initial segments of the degrees of size ℵ1
We settle a series of questions first raised by Yates at the Jerusalem (1968) Colloquium on Mathematical Logic by characterizing the initial segments of the degrees of unsolvability of size ℵ1: Every upper semi-l...
