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math.MG2015
A Universal Separable Diversity
David Bryant, André Nies, Paul Tupper
The Urysohn space is a separable complete metric space with two fundamental properties: (a) universality: every separable metric space can be isometrically embedded in it; (b) ultr…
math.LO2015
Logic Blog 2014
Andre Nies
The 2014 Logic Blog starts with open questions from the May IMS program in Singapore. It contains results on randomness, including answers to some open questions in higher randomne…