This is the arXiv version.

# Category Archives: Article announcement

# The Logic Blog archives

André has posted the Logic Blogs from previous years on ArXiv:

# Wikipedia article on K-triviality

There finally is a Wikipedia article on K-triviality

It was originally written by me and my summer student Jing Zhang (NUS)

Lots of red links there to be filled.

Andre

# Brattka, Gherardi, Hölzl: Probabilistic Computability and Choice

Available on arXiv.

We study the computational power of randomized computations on infinite objects, such as real numbers. In particular, we introduce the concept of a Las Vegas computable multi-valued function, which is a function that can be computed on a probabilistic Turing machine that receives a random binary sequence as auxiliary input. The machine can take advantage of this random sequence, but it always has to produce a correct result or to stop the computation after finite time if the random advice is not successful. With positive probability the random advice has to be successful. We characterize the class of Las Vegas computable functions in the Weihrauch lattice with the help of probabilistic choice principles and Weak Weak König’s Lemma. Among other things we prove an Independent Choice Theorem that implies that Las Vegas computable functions are closed under composition. In a case study we show that Nash equilibria are Las Vegas computable, while zeros of continuous functions with sign changes cannot be computed on Las Vegas machines. Continue reading