Epimorphisms of C*-algebras are surjective

We answer a question raised by V.G.Pestov in the affirmative.Comment: 2 page

It Takes More than Moore to Answer Existence-Questions

© 2019 Springer Nature. This is a post-peer-review, pre-copyedit version of an article published in Erkenntnis. The final authenticated version is available online at: https://doi.org/10.1007/s10670-019-00107-4Several recent discussions of metaphysics disavow existence-questions, claiming that they are metaphysically uninteresting because trivially settled in the affirmative by Moorean facts. This is often given as a reason to focus metaphysical debate instead on questions of grounding. I argue that the strategy employed to undermine existence-questions fails against its usual target: Quineanism. The Quinean can protest that the formulation given of their position is a straw man: properly understood, as a project of explication, Quinean metaphysics does not counsel us to choose between obvious ordinary-language claims and absurd revisionist claims, even if appeal to Moorean facts is permitted.Peer reviewedFinal Accepted Versio

Was Ovid a Silver Latin Poet?

published or submitted for publicatio

Chiral Fermions and Anomalies on a Finite Lattice

A recent proposal by Kaplan for a chiral gauge theory on the lattice is tested with background gauge fields. The spectrum of the finite lattice Hamiltonian is calculated and the existence of a chiral fermion is demonstrated. Lattice doublers are found to decouple. The flavor anomalies, which are in agreement with the continuum anomaly relation, are obeserved on a finite lattice. Non-trivial anomaly cancellation is observed in a chiral gauge current.Comment: UCSD/PTH 92-1

Finite automata models of quantized systems: conceptual status and outlook

Since Edward Moore, finite automata theory has been inspired by physics, in particular by quantum complementarity. We review automaton complementarity, reversible automata and the connections to generalized urn models. Recent developments in quantum information theory may have appropriate formalizations in the automaton context.Comment: 12 pages, prepared for the Sixth International Conference on Developments in Language Theory, Kyoto, Japan, September 18-21, 200