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- Greg Hjorth, Alexander S. Kechris
- Ann. Pure Appl. Logic
- 1996

- GREG HJORTH
- 2005

Every non-amenable countable group induces orbit inequivalent ergodic equivalence relations on standard Borel probability spaces. Not every free, ergodic, measure preserving action of F2 on a standard Borel probability space is orbit equivalent to an action of a countable group on an inverse limit of finite spaces. There is a treeable non-hyperfinite Borel… (More)

- Greg Hjorth
- J. Symb. Log.
- 1993

- Greg Hjorth, Alexander S. Kechris
- J. Symb. Log.
- 1995

JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. Association for… (More)

- Greg Hjorth, Bakhadyr Khoussainov, Antonio Montalbán, André Nies
- 2008 23rd Annual IEEE Symposium on Logic in…
- 2008

We study the classes of Buchi and Rabin automatic structures. For Buchi (Rabin) automatic structures their domains consist of infinite strings (trees), and the basic relations, including the equality relation, and graphs of operations are recognized by Buchi (Rabin) automata. A Buchi (Rabin) automatic structure is injective if different infinite strings… (More)

An analog of ML-randomness in the effective descriptive set theory setting is studied, where the r.e. objects are replaced by their Π1 counterparts. We prove the analogs of the Kraft-Chaitin Theorem and Schnorr’s Theorem. In the new setting, while K-trivial sets exist that are not hyper-arithmetical, each low for random set is. Finally we study a very… (More)

- Greg Hjorth, Alexander S. Kechris
- Bulletin of Symbolic Logic
- 1997

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- Greg Hjorth
- J. Symb. Log.
- 2009

- Greg Hjorth
- J. Symb. Log.
- 2001