The older publications are not available electronically; please contact me for hard copy.
Inner and Outer Models for Constructive Set Theories, in The Handbook of Constructive Mathematics, to appear: Available in pdf format.
Feedback Hyperjump, Proceedings of LFCS 2020, Lecture Notes in Computer Science #11972, Springer, 2020, pp. 144-155: Available in pdf format; also, joint with Juan Aguilera, an improved version at Journal of Logic and Computation , Volume 31, Issue 1, January 2021, pp. 20-39, https://doi.org/10.1093/logcom/exaa085.
Notions of Cauchyness and Metastability, joint with Hannes Diener, Proceedings of LFCS 2018, Lecture Notes in Computer Science #10703, Springer, 2018, pp. 140-153: Available in pdf format; also an improved version at Journal of Logic and Computation , Volume 30, Issue 8, December 2020, pp. 1487-1504, https://doi.org/10.1093/logcom/exaa046.
An Introduction to Feedback Turing Computability, joint with Nathanael Ackerman and Cameron Freer, Journal of Logic and Computation, Volume 30, Issue 1, January 2020, pp. 27-60, https://doi.org/10.1093/logcom/exaa002: Available in pdf format.
Feedback Computability on Cantor Space, joint with Nathanael Ackerman and Cameron Freer, LICS 2015 issue, Logical Methods in Computer Science, Volume 15, Issue 2 (2019), pp. 7:1 - 7:18, see here: Available in pdf format.
Separating the Fan Theorem and Its Weakenings II, Proceedings of LFCS 2018, Lecture Notes in Computer Science #10703, Springer, 2018, pp. 242-255: Available in pdf format; also Journal of Symbolic Logic, 84 (2019), pp. 1484-1509, doi: 10.1017/jsl.2019.1: Available in pdf format.
Parallel Feedback Turing Computability, in Proceedings of LFCS '16, Lecture Notes in Computer Science #9537 (Sergei N. Artemov and Anil Nerode, eds.), Springer, 2016, pp. 236-250: Available in pdf format.
Feedback Turing Computability, and Turing Computability as Feedback, joint with Nathanael Ackerman and Cameron Freer, Proceedings of LICS 2015, Kyoto: Available in pdf format.
Choice and the Hat Game, joint with Stefan Geschke and Mona Rahn, Research Institute for Mathematical Sciences, Kyoto University, Kokyuroku series #1949, 2015, pp. 34-44: Available in pdf format.
Separating fragments of WLEM, LPO, and MP, joint with Matt Hendtlass, Journal of Symbolic Logic, 81, No. 4 (2016), pp. 1315-1343, doi: 10.1017/jsl.2016.38: Available in pdf format.
Elementary Epimorphisms between Models of Set Theory, joint with Norman Lewis Perlmutter, Archive for Mathematical Logic, 55 (2016), pp. 759-766: Available in pdf format.
On Extensions of Supercompactness, joint with Norman Lewis Perlmutter, Mathematical Logic Quarterly, 61, No. 3 (2015), pp. 217-223, doi: 10.1002/malq.201400030: Available in pdf format.
Realizability Models Separating Various Fan Theorems, joint with Michael Rathjen, Proceedings, Computability in Europe 2013, Lecture Notes in Computer Science #7921 (Bonizzoni, Brattka, and Loewe, eds.), Springer, 2013, pp. 306-315: Available in pdf format.
Separating the Fan Theorem and Its Weakenings, joint with Hannes Diener, in Proceedings of LFCS '13, Lecture Notes in Computer Science #7734 (Sergei N. Artemov and Anil Nerode, eds.), Springer, 2013, pp. 280-295; also Journal of Symbolic Logic, 79, No. 3 (2014), pp. 792-813, doi: 10.1017/jsl.2014.9, electronically at http://journals.cambridge.org/repo_A93dDBX7: Available in pdf, dvi, and ps formats. Also available, along with the BD-N results in the following paper, as slides.
Principles Weaker than BD-N, joint with Hannes Diener, Journal of Symbolic Logic, 78, No. 3 (2013), pp. 873-885: Available in pdf, dvi, and ps formats. Also available, along with the Fan Theorem results in the preceding paper, as slides.
Walker's Cancellation Theorem, joint with Fred Richman, Communications in Algebra, 42, No. 4 (2014), pp. 1644-1649, doi: 10.1080/00927872.2012.747598: Available in pdf format.
The Kripke Schema in Metric Topology, joint with Fred Richman and Peter Schuster, Mathematical Logic Quarterly, 58, No. 6 (2012), pp. 498-501, doi: 10.1002/malq.201200018: Available in pdf format.
On the Structure of Honest Elementary Degrees, joint with Lars Kristiansen, Jan-Christoph Schlage-Puchta, and Andreas Weiermann, Proceedings of the 2009-2011 CRM Infinity Project : Available in pdf format.
Feedback ITTMs and Sigma-0-3-Determinacy: Available as slides.
On the Failure of BD-N, Journal of Symbolic Logic, 78, No. 1 (2013), pp. 39-56: Available in pdf, dvi, and ps formats. Also available as slides.
Geometric Spaces with No Points, Journal of Logic and Analysis, http://logicandanalysis.org/, 2, No. 6 (2010), pp. 1-10, doi 10.4115/jla2010.2.6: Available in pdf, dvi, and ps formats. Also available as slides.
Zero Sets of Univariate Polynomials, joint with Fred Richman, Transaction of the AMS, 362 (2010), pp. 6619-6632: Available in pdf and dvi formats. Also available as slides under the name "The Weak Fundamental Theorem of Algebra."
Topological Forcing Semantics with Settling, Proceedings of LFCS '09, Lecture Notes in Computer Science (Sergei N. Artemov and Anil Nerode, eds.), Springer, 2009; also Annals of Pure and Applied Logic, 163 (2012), pp. 820-830, doi 10.1016/j.apal.2011.09.014: Available in pdf, dvi, and ps formats, and as slides.
Well-founded Iterations of Infinite Time Turing Machines, in Ways of Proof Theory (Ralf Schindler, ed.), Ontos, 2010: Available in pdf, dvi, and ps formats, and as slides.
Signed-Bit Representations of Real Numbers, joint with Fred Richman, Journal of Logic and Analysis, http://logicandanalysis.org/, 1, No. 18 (2009), pp. 1-18, doi 10.4115/jla.2009.1.10: Available in pdf, dvi, and ps formats, and as slides.
On the Constructive Dedekind Reals, joint with Michael Rathjen, Proceedings of LFCS '07, Lecture Notes in Computer Science #4514 (Sergei N. Artemov and Anil Nerode, eds.), Springer, 2007, pp. 349-362, also Logic and Analysis, 1, No. 2 (2008), pp. 131-152: Available in pdf, dvi, and ps formats. (The journal Logic and Analysis is now accessible via the website for The Journal of Logic and Analysis here.)
On the Cauchy Completeness of the Constructive Cauchy Reals, Mathematical Logic Quarterly, 53, No. 4-5 (2007), pp. 396-414: Available in pdf, dvi, and ps formats.
CZF and Second Order Arithmetic, Annals of Pure and Applied Logic, 141 (2006), pp. 29-34: Available in pdf, dvi, and ps formats.
Independence Results around Constructive ZF, Annals of Pure and Applied Logic, 132, No. 2-3 (2005), pp. 209-225: Available in pdf, dvi, and ps formats.
On the Regular Extension Axiom and Its Variants (joint with Michael Rathjen), Mathematical Logic Quarterly, 49, No. 5 (2003), pp. 511-518: Available in pdf format; see also Rathjen's home page.
IKP and Friends, Journal of Symbolic Logic, 67 (2002), pp. 1295-1322: Available in pdf, dvi, and ps formats.
Intuitionistic L, in Logical Methods in Computer Science: The Nerode Conference (Crossley et al., eds.), Birkhauser, 1993, pp. 555-571: Available here.
μ-definable Sets of Integers, Journal of Symbolic Logic, 58 (1993), pp. 291-313
An Introduction to γ-recursion Theory, Journal of Symbolic Logic, 55 (1990), pp. 194-206
μ-definable Sets of Integers, Proceedings of the 4th Annual Symposium on Logic in Computer Science, IEEE Computer Society Press, 1989, pp. 343-352
There's No Forcing a Least Uper Bound, Proceedings of the American Mathematical Society, 105 (1989), pp. 998-1002
Sacks Forcing Sometimes Needs Help to Produce a Minimal Upper Bound, Journal of Symbolic Logic, 54 (1989), pp. 490-498
Definability and Initial Segments of c-degrees, Journal of Symbolic Logic, 53 (1988), pp. 1070-1081
Admissibility Spectra and Minimality, Annals of Pure and Applied Logic, 40 (1988), pp. 257-276
Playing with Admissibility Spectra, Israel Journal of Mathematics, 63 (1988), pp. 243-256
Another Extension of Van de Wiele's Theorem, Annals of Pure and Applied Logic, 38 (1988), pp. 301-306
Hook-up Security and Generalized Restrictiveness, Proceedings of the 12th National Computer Security Conference, Baltimore, pp. 111-122
The SDOS Project -- Verifying Hook-Up Security, Proceedings of the 1987 Aerospece Computer Security Conference, Orlando, Florida , AIAA (with Doug Weber)
Simple R.E. Degree Structures, Journal of Symbolic Logic, 52 (1987), pp. 203-213
Uncountable Master Codes and the Jump Hierarchy, Journal of Symbolic Logic, 52 (1987), pp. 952-958
Lattices of c-degrees, Annals of Pure and Applied Logic, 36 (1987), pp. 115-118
Admissibility Spectra through Aleph-1, Israel Journal of Mathematics, 60 (1987), pp. 225-235
