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<h1>David Schrittesser</h1>
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<section>
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<p> I work as <ahref="https://www.utsc.utoronto.ca/cms/david-schrittesser">Research Associate</a> in statistics and mathematics at the <ahref="https://www.utoronto.ca/">University of Toronto</a>,
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and soon also at the <ahref="http://im.hit.edu.cn/en/">Institute for Advanced Studies in Mathematics</a> at <ahref="http://www.hit.edu.cn/">Harbin Institute of Technology</a>, where I have a position as Professor.
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<p> I currently hold the position of Professor at the <ahref="http://im.hit.edu.cn/en/">Institute for Advanced Studies in Mathematics</a> at <ahref="http://www.hit.edu.cn/">Harbin Institute of Technology</a>.
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</p>
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<p>Until recently, I was the main organizer of the <ahref="http://www.fields.utoronto.ca/activities/21-22/set-theory-seminar">Set Theory Seminar at the Fields Institute</a>.</p>
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<p>Before that, I was <ahref="https://www.utsc.utoronto.ca/cms/david-schrittesser">Research Associate</a> in statistics and mathematics at the <ahref="https://www.utoronto.ca/">University of Toronto</a>. During my time there I was also main organizer of the <ahref="http://www.fields.utoronto.ca/activities/21-22/set-theory-seminar">Set Theory Seminar at the Fields Institute</a>.</p>
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</p>
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</section>
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<section>
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<h2>News</h2>
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<p>
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<ul>
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<li>
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I've started a book project with <ahref="http://danroy.org/">Dan M. Roy</a> and <ahref="https://hyperfinite.net/">Haosui Duanmu</a> based on my lecture notes for the course I taught at University of Toronto, about nonstandard analysis and statistical decisions theory.
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<li>A short text by me together with typographical design by Stefanie Wurnitsch will be on display at the Museumsquartier in Vienna, Austria in the <ahref="http://www.typopassage.at/">Typopassage</a>. If you want to know more about the contents, don't hesitate to write me an email (see bottom of this page)! I was invited to participate in this project by <ahref="https://www.studiotid.com/">Toledo i Dertschei</a>.
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</li>
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<li>
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I gave a talk at <ahref="">SETTOP 2022</a> in Novi Sad about applications of nonstandard analysis in statistics.
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</li>
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<li>I gave a <ahref="https://ps-mathematik.univie.ac.at/e/index.php?event=stc22&page=talk-details&id=1263"> talk at the <ahref="https://ps-mathematik.univie.ac.at/e/index.php?event=stc22">36th Summer Topology Conference</a> about the internal probability measures giving rise to a fixed Loeb measure.
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<li> I am visiting the <ahref="http://www.fields.utoronto.ca/about">Fields Institute</a>
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as part of the
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<ahref="http://www.fields.utoronto.ca/activities/22-23/set"> Thematic Program on Set Theoretic Methods in Algebra, Dynamics and Geometry</a>.
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</li>
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<li>I will be Professorial Research Fellow at the
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<ahref="http://www.logic.univie.ac.at">Kurt Gödel Research Center</a> at the
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<ahref="http://www.univie.ac.at">University of Vienna</a> for a while.
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</li>
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<li>
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I gave a talk at the <ahref="https://www.esi.ac.at/events/e429/"> Set Theory workshop at the Erwin Schrödinger Institute</a> about the descriptive set theory of maximal independent sets. The talk was even recorded and you can <ahref="https://youtu.be/yVef10Hrnyo">watch it</a>.
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</li>
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<li>
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I gave a talk at <ahref="https://gravitypull.swoogo.com/bff7/Home">BFF7</a> about my joint paper with <ahref="http://danroy.org/">Dan M. Roy</a> and <ahref="https://hyperfinite.net/">Haosui Duanmu</a> in which we <ahref="https://arxiv.org/abs/2112.14257">characterize admissibility</a> in statistical decision problems.
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</li>
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<li>
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<ahref="http://www.fields.utoronto.ca/talks/taste-nonstandard-analysis-and-statistical-decision-theory">Here is a talk I gave</a> at the Fields Institute Set Theory Seminar, also about applications of nonstandard analysis in statistics, intended for an audience with a background in set theory (recorded on zoom).
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</li>
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<li> My joint paper with Karen Bakke Haga and <ahref="http://www.math.ku.dk/%7Easgert/">Asger
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Törnquist</a> about <ahref="https://doi.org/10.1142/S0219061321500264">Maximal almost disjoint families, determinacy, and forcing</a> has appeared in the
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Journal of Mathematical Logic.
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</li>
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<li> My joint paper with Sandra Müller, Philipp Schlicht, and Thilo Weinert about <ahref="https://link.springer.com/article/10.1007/s11856-022-2312-8">Lebesgue's density theorem and definable selectors for ideals</a> has appeared in the Israel Journal of Mathematics.
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</li>
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I've been working on a book project with about nonstandard analysis and statistical decisions theory.
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</li>
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<li> My student Severin Mejak (who I supervised jointly with Asger Törnquist) obtained his PhD at the University of Copenhagen in February 2023. Congrats!
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</li>
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</ul>
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</p>
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</section>
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<h2>Students</h2>
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<li> Severin Mejak (PhD, ongoing). I am co-advising Severin with Asger Törnquist. Severin has submitted his thesis in December 2022 and will defend in Febraury, 2023.
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<li> Severin Mejak, PhD thesis, title: Definability of maximal discrete sets. I co-advised Severin with Asger Törnquist. Severin defended in February 2023. The part of the thesis I supervised is now a joint article called ‘Definability of maximal cofinitary groups’ (see below).
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</li>
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<li> Karen Bakke Haga, PhD thesis, title: Maximal almost disjoint families, determinacy, and forcing. Karen defended on June 3, 2019. I co-advised her with Asger Törnquist. </li>
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</li>
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<li><ahref="https://dsnielsen.com/">Dan Saattrup Nielsen</a>, master thesis, title: <ahref="https://github.com/saattrupdan/MSc-thesis">Inner model theory. An introduction</a>.
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<li><ahref="http://dsnielsen.com/">Dan Saattrup Nielsen</a>, master thesis, title: <ahref="https://github.com/saattrupdan/MSc-thesis">Inner model theory. An introduction</a>.
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</li>
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<li> I also advised bachelor projects by Magnus Baunsgaard Kristensen, Fraser Binns, and (co-advised) Dan Saattrup Nielsen (he wrote a <ahref="https://github.com/saattrupdan/BSc-thesis">thesis about Gödel's constructible universe</a>).
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<li> I also advised bachelor projects by Magnus Baunsgaard Kristensen, Fraser Binns, and (co-advised) Dan Saattrup Nielsen (he wrote a <ahref="http://github.com/saattrupdan/BSc-thesis">thesis about Gödel's constructible universe</a>).
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</li>
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</ul>
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@@ -176,19 +168,20 @@ <h2>Publications</h2>
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</li>
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<li>
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<ahref="https://arxiv.org/abs/2105.11318"> Constructing maximal cofinitary groups </a>. (2021) 30 pages. To appear in <i>Nagoya Mathematical Journal</i>.
<li> (joint with Haosui Duanmu and Daniel M. Roy) <ahref="https://arxiv.org/abs/2112.14257">Admissibility is Bayes optimality with infinitesimals</a>.
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<li> (joint with Haosui Duanmu and Daniel M. Roy) <ahref="https://arxiv.org/abs/2112.14257">Admissibility is Bayes optimality with infinitesimals</a>. 17 pages.
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</li>
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<li> (joint with Haosui Duanmu and William Weiss) <ahref="https://arxiv.org/abs/2112.13955">Loeb extension and Loeb equivalence II</a>.
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<li> (joint with Haosui Duanmu and William Weiss) <ahref="https://arxiv.org/abs/2112.13955">Loeb extension and Loeb equivalence II</a>.<ahref="https://doi.org/10.4064/fm163-1-2023">Fundamenta Mathematicae</a>. 13 pages.
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</li>
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<li> (joint with Severin Mejak) <ahref="https://arxiv.org/abs/2212.05318">Definability of maximal cofinitary groups</a>.
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23 pages.
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</li>
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<li> (joint with Haosui Duanmu and Daniel M. Roy) <ahref="https://arxiv.org/abs/2212.13250">Statistical minimax theorems via nonstandard analysis</a>.
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<li> (joint with Haosui Duanmu and Daniel M. Roy) <ahref="https://arxiv.org/abs/2212.13250">Statistical minimax theorems via nonstandard analysis</a> 22 pages.
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</li>
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<h2>Upcoming and past talks and travel</h2>
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<h2>Past talks and travel</h2>
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<li> March, April, and May 2023: Sichuan University Logic Workshop; Logic Seminar at the Chinese Academy of Science, Beijing;
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Nankai University; Logic Workshop Wuhan University; Chinese National Congress of Mathematics, Wuhan.
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</li>
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<li>2021: Novi Sad Conference in Set theory and General Topology (SETTOP), Serbia.
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<li>September/November 2021: DMV-ÖMG (Austrian and German Mathematical Society) joint annual conference,
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<li>January 2020: Visiting <ahref="https://people.maths.bris.ac.uk/~mapdw/">Philip Welch</a> at University of Bristol.
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</li>
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<li>November 2019: <ahref="http://www.sic.shibaura-it.ac.jp/~ikegami/RIMS2019.html">RIMS Workshop</a>, Kyoto; and visiting Jörg Brendle at Kobe University, Japan.
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