| author | Christian Urban <christian dot urban at kcl dot ac dot uk> |
| Tue, 16 Apr 2013 00:22:46 +0100 | |
| changeset 187 | c3c3cfc278d1 |
| parent 184 | b9e6ac16583d |
| child 191 | f1b295d4f77b |
| permissions | -rw-r--r-- |
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<TITLE>Homepage of Christian Urban</TITLE> |
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<B>Links</B><BR> |
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<A HREF="http://www.inf.kcl.ac.uk/staff/urbanc/index.html">Home</A><BR> |
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<A HREF="http://www.inf.kcl.ac.uk/staff/urbanc/publications.html">Publications</A><BR> |
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<A HREF="http://www.inf.kcl.ac.uk/staff/urbanc/teaching.html">Teaching</A><BR> |
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<A HREF="http://www.inf.kcl.ac.uk/staff/urbanc/travelling.html">Recent Talks</A><BR> |
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<A HREF="http://isabelle.in.tum.de/nominal/">My Research Group</A> |
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<BR> |
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<BR> |
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<B>Handy Information</B><BR> |
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<A HREF="http://www.inf.kcl.ac.uk/staff/urbanc/logic.html">People in Logic</A><BR> |
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<A HREF="http://www.inf.kcl.ac.uk/staff/urbanc/programming.html">Programming Languages</A><BR> |
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<A HREF="http://www.inf.kcl.ac.uk/staff/urbanc/misc.html">Miscellaneous</A> |
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<BR><BR> |
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<A HREF="http://isabelle.in.tum.de/nominal/"> |
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<IMG SRC="nominal-logo.gif" ALT="" style="border-width: 0px;" align="left"></A> |
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<A HREF="http://www.inf.kcl.ac.uk/staff/urbanc/Cookbook/"> |
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<A NAME="Home"></A> |
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<TABLE> |
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<H1>Christian Urban</H1> |
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<B>E-mail</B> |
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christian.urban <I>at</I> kcl ac uk<BR> |
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<BR> |
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<B>Address</B> |
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<A HREF="http://www.inf.kcl.ac.uk">Department of Informatics</A>, |
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<A HREF="http://www.kcl.ac.uk">King's College London</A>, |
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Strand, London WC2R 2LS, UK. My office is S1.27 on the 1st floor of the Strand Building. |
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<BR><BR> |
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<B>Fax</B> +44 20 7848 2851 |
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<A HREF="http://www.inf.kcl.ac.uk/staff/urbanc/picture-small.jpg"><IMG ALT="" SRC="picture-small.jpg" align="top"></A> |
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<p> |
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<IMG SRC="new.gif" ALT="" style="" align="left"><A HREF="http://www.inf.kcl.ac.uk/staff/urbanc/Cookbook" target="_top">Isabelle Programming Tutorial</A> (draft of a 200-page tutorial on Isabelle programming)<BR> |
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</TD> |
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<TD BGCOLOR="#FFFFFF" WIDTH="75%"> |
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<B>Current Position</B> |
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I am a lecturer in the Department of Informatics at King's College London. |
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This is similar to a position of an assistant professor in other places. In 2011, |
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I was also offered a lectureship |
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<A HREF="http://www.it.uu.se/" TITLE="Uppsala">here</A>, an associate professorship |
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<A HREF="http://www.itu.dk/en/" TITLE="ITU, Copenhagen">here</A>, |
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and full professorships |
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<A HREF="http://www.ustcsz.edu.cn/kedweb/" TITLE="IAS, Suzhou">here</A> and |
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<A HREF="http://www.sei.ecnu.edu.cn/" TITLE="Shanghai">here</A>. |
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I thank all people involved for their efforts. |
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<P> |
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<B>Past Positions</B> |
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In April 2006, I was awarded an <A HREF="http://en.wikipedia.org/wiki/Emmy_Noether">Emmy-Noether</A> |
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<A HREF="http://www.dfg.de/en/research_funding/programmes/individual/emmy_noether/in_brief/index.html">fellowship</A>, which I held at the <A HREF="http://www.in.tum.de/en.html">TU Munich</A> until |
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September 2011. |
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Between September 2008 and February 2009, I was an invited research scientist in |
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the <A HREF="http://www.cs.princeton.edu/">Department of Computer Science</A> in Princeton. |
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In 2004/05 I was an Alexander-von-Humboldt fellow in Munich and |
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from 2000 until 2004 I was awarded a Research Fellowship in Cambridge. Before that |
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I did my PhD in Cambridge funded by two scholarships from the German Academic Exchange |
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Service (<A HREF="http://www.daad.de/index.html">DAAD</A>). |
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<P> |
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<B>Research Interests</B> theorem provers, verification, programming languages, compilers, |
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algorithms, proof theory, type systems, concurrency, lambda calculus, unification, |
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regular expressions, computability, complexity, functional and logic programming. |
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<P> |
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<B>Conferences</B> |
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<A HREF="http://www.iiia.csic.es/~levy/unif06/">UNIF'06</A> (member of PC), |
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<A HREF="http://www.cs.mcgill.ca/~bpientka/lfmtp07">LFMTP'07</A> (member of PC), |
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<A HREF="http://isabelle.in.tum.de/nominal/activities/lfmtp08/">LFMTP'08</A> (PC co-chair), |
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<A HREF="http://www.cis.upenn.edu/~sweirich/wmm/">WMM'08</A> (member of PC), |
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<A HREF="http://www.mat.ufmg.br/lsfa2008/">LSFA'08</A> (invited speaker), |
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<A HREF="http://www.inf.kcl.ac.uk/staff/maribel/TAASN.html">TAASN'09</A> (member of PC), |
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<A HREF="http://lsfa09.cic.unb.br/">LSFA'09</A> (member of PC), |
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<A HREF="http://isabelle.in.tum.de/nominal/activities/tphols09/idw.html">IDW'09</A> (organiser), |
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<A HREF="http://www.seas.upenn.edu/~sweirich/wmm/wmm09.html">WMM'09</A> (PC chair), |
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<A HREF="https://isabelle.in.tum.de/nominal/activities/tphols09/">TPHOLs'09</A> (PC co-chair), |
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<A HREF="http://dream.inf.ed.ac.uk/events/automatheo-2010/">Automatheo'10</A> (member of PC), |
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<A HREF="http://www.floc-conference.org/">ITP'10</A> (member of PC), |
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<A HREF="http://www.inf.kcl.ac.uk/staff/maribel/UNIF/UNIF.html">UNIF'10</A> (invited speaker), |
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<A HREF="http://www.cis.upenn.edu/~bcpierce/wmm/">WMM'10</A> (invited speaker), |
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<A HREF="http://isabelle.in.tum.de/nominal/activities/idw10/idw.html">IDW'10</A> (co-organiser), |
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<A HREF="http://formes.asia/cpp">CPP'11</A> (member of PC), |
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<A HREF="http://www.rdp2011.uns.ac.rs/rta/">RTA'11</A> (member of PC), |
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<A HREF="http://lfmtp11.cs.umn.edu">LFMTP'11</A> (member of PC) |
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<P> |
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<B>Current PostDocs</B> Chunhan Wu, Zhenjiang Qian<BR> |
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Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
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<B>Former PostDocs</B> <A HREF="http://cl-informatik.uibk.ac.at/users/cek/">Cezary Kaliszyk</A>, |
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added former postdocs
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
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<A HREF="http://dpt-info.u-strasbg.fr/~narboux/">Julien Narboux</A> |
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</TD> |
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<TD BGCOLOR="#FFFFFF" WIDTH="75%"> |
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<B>Nominal Isabelle</B> |
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I currently work on Nominal |
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<A HREF="http://isabelle.in.tum.de">Isabelle</A>. This is joint work with |
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<A HREF="http://wwwbroy.in.tum.de/~berghofe/">Dr Stefan Berghofer</A>, |
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Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
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<A HREF="https://www.lri.fr/~wenzel/">Dr Markus Wenzel</A>, |
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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<A HREF="http://cl-informatik.uibk.ac.at/users/cek/">Dr Cezary Kaliszyk</A>, |
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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<A HREF="http://user.it.uu.se/~tjawe125/">Dr Tjark Weber</A> and |
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the Isabelle-team in Munich. |
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Many of the theoretical ideas originate from the nominal logic project - a wonderful project headed |
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by <A HREF="http://www.cl.cam.ac.uk/~amp12/">Prof. Andrew Pitts</A>. |
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The aim of my work is to make formal reasoning involving binders as simple as |
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on paper and the hope is to lure |
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<A HREF="http://alliance.seas.upenn.edu/~plclub/cgi-bin/poplmark/index.php?title=The_POPLmark_Challenge#Vision">masses</A> to automated |
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theorem proving. My funding for this work was provided in 2004 and 2005 by a research |
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fellowship from the |
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<A HREF="http://en.wikipedia.org/wiki/Alexander_von_Humboldt">Alexander-von-Humboldt</A> |
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<A HREF="http://www.humboldt-foundation.de/web/home.html">foundation</A>. During this time I was a visitor in the group of |
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<A HREF="http://www.mathematik.uni-muenchen.de/~schwicht/">Prof. Helmut Schwichtenberg</A>. |
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Since 2006 this work is supported by an |
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<A HREF="http://en.wikipedia.org/wiki/Emmy_Noether">Emmy-Noether</A> |
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<A HREF="http://www.dfg.de/en/research_funding/programmes/individual/emmy_noether/in_brief/index.html">fellowship</A>. |
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There is a <A HREF="http://isabelle.in.tum.de/nominal/">webpage</A> and a |
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<A HREF="https://mailmanbroy.informatik.tu-muenchen.de/mailman/listinfo/nominal-isabelle">mailing list</A> |
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about Nominal Isabelle. It also includes a list of projects that use Nominal Isabelle. |
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Users of Nominal Isabelle had their papers appearing at LICS, POPL, FOSSACS, SOS, TPHOLs, CPP and SEFM. |
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</TD> |
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<TD BGCOLOR="#FFFFFF" WIDTH="75%"> |
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<B>Myhill-Nerode and Regular Expressions</B> |
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Out of frustration of having to teach reasoning in theorem provers with worn-out examples like |
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fib and even/odd, we implemented a large part of regular language theory in Isabelle/HOL. |
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This <A HREF="http://afp.sourceforge.net/devel-entries/Myhill-Nerode.shtml">implementation</A> |
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gives rise to much more interesting examples, as shown |
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<A HREF="http://www.cs.cmu.edu/~rwh/papers/regexp/jfp.pdf">here</A> and |
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<A HREF="http://ropas.snu.ac.kr/~kwang/paper/06-jfp-yi.pdf">here</A>. It turns out that |
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formalisations of automata theory are a huge |
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<A HREF="https://lists.cam.ac.uk/pipermail/cl-isabelle-users/2005-September/msg00012.html">pain</A> |
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in theorem provers, especially in those that are based on HOL. |
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We therefore went against the |
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<A HREF="http://books.google.com/books?id=8lKyxS8_CNoC&pg=PA14&source=gbs_toc_r&cad=4#v=onepage&q&f=false">mainstream</A> |
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and used in our formalisation regular expressions exclusively, |
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because they are much more convenient for formal reasoning. The results we |
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formalised include: the Myhill-Nerode theorem, the closure of regular languages |
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under complementation, finiteness of derivatives of regular expressions and a surprising |
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result about Subseq, which according to |
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this |
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<A HREF="http://blog.computationalcomplexity.org/2006/01/theorem-that-should-be-better-known.html">blog</A> |
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should be better known. This is joint work with Prof. Xingyuan |
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Zhang and his student Chunhan Wu from the |
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<A HREF="http://www.ust.com.cn/">PLA University of Science and Technology</A> in Nanjing. |
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My funding for this work came from the |
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<A HREF="http://www.sinogermanscience.org.cn/">Chinese-German Research Centre</A>. |
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</TD> |
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<TD BGCOLOR="#FFFFFF" WIDTH="75%"> |
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<B>Nominal Unification and Alpha-Prolog</B> |
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<A HREF="http://www.inf.kcl.ac.uk/staff/urbanc/Unification">Nominal unification</A> is one outcome of |
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my involvement in the nominal logic project in Cambridge. Another is the logic programming language |
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alpha-Prolog (joint work with <A HREF="http://homepages.inf.ed.ac.uk/jcheney/">Dr James Cheney</A>), |
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which uses nominal unification - click for details |
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<A HREF="http://homepages.inf.ed.ac.uk/jcheney/programs/aprolog/">here</A>. |
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The nominal unification algorithm has been |
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<A HREF="http://www.inf.kcl.ac.uk/staff/urbanc/Unification">formally verified</A> in Isabelle. This |
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was possible since this unification algorithm is formulated in a simple first-order language |
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(unlike other algorithms for higher-order unification). |
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<A HREF="http://www.cs.indiana.edu/~dfried/">Prof. Daniel Friedman</A> and his group use nominal |
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unification in their alpha-Kanren system implemented in Scheme. |
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<A HREF="http://www.inf.kcl.ac.uk/staff/maribel/">Prof. Maribel Fernandez</A> and her student |
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improved the nominal unification algorithm to be quadratic. |
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My funding for this work was provided through a research fellowship from |
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<A HREF="http://www.corpus.cam.ac.uk">Corpus Christi College</A>, Cambridge. |
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</TD> |
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<B>Classical Logic</B> |
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I was Ph.D. student in the University of Cambridge |
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<A HREF="http://www.cl.cam.ac.uk">Computer Laboratory</A> |
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and for three years |
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called Gonville and Caius College my home. I was very lucky to have |
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<A HREF="http://research.microsoft.com/~gmb/">Dr Gavin Bierman</A> |
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as supervisor. My research in Cambridge was also very much influenced by |
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<A HREF="http://www.dpmms.cam.ac.uk/~martin/">Prof. Martin Hyland</A>. |
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Some details on my thesis "Classical Logic and Computation" are |
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<A HREF="http://www.inf.kcl.ac.uk/staff/urbanc/PhD/index.html">elsewhere</A>, including |
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a <A HREF="http://www.inf.kcl.ac.uk/staff/urbanc/Cut/cutapplet.html">Java Applet</A> that |
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'visualises' some of the results from the thesis. I completed the writing of |
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the thesis in <A HREF="http://iml.univ-mrs.fr/ldp/">Marseille</A> in the group of |
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<A HREF="http://iml.univ-mrs.fr/~girard/">Prof. Jean-Yves Girard</A>. My study in |
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Cambridge was funded by two <A HREF="http://www.daad.de/index.html">scholarships</a> |
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from the German government; my year in Marseille by a TMR-fellowship from the EU. |
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My PhD was also one starting point for the EPSRC Project on the Semantics of Classical |
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Proofs. The strong normalisation result in the PhD has been used in 2007 by |
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<A HREF="http://www.loria.fr/~ckirchne/hot.html">Prof. Claude Kirchner</A> and his |
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students for proving consistency of their superdeduction system lemuridae. |
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</TD> |
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<TD BGCOLOR="#FFFFFF" WIDTH="75%"> |
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<B>Forum</B> |
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I implemented Forum, a programming language based on classical linear logic, |
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as my M.Phil. thesis. This was joint work with |
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<A HREF="http://www.cs.st-andrews.ac.uk/~rd/">Dr Roy Dyckhoff</A>. |
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Details can be found |
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<A HREF="http://www.cs.st-andrews.ac.uk/~rd/logic/nonmac/">here</A> and |
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<A HREF="http://www.lix.polytechnique.fr/Labo/Dale.Miller/forum/">here</A>. During my |
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M.Phil study I spent one month in Philadelphia invited by |
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<A HREF="http://www.lix.polytechnique.fr/~dale/">Prof. Dale Miller</A>. |
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</TD> |
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<TR> |
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<TD BGCOLOR="#FFFFFF" WIDTH="75%"> |
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<B>G4ip</B> An implementation of G4ip using the imperative language Pizza can be found |
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<A HREF="http://www.inf.kcl.ac.uk/staff/urbanc/Prover/index.html">here</A>. |
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<A HREF="http://pizzacompiler.sourceforge.net">Pizza</A>, written around 1996, is a conservative |
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extension of Java and a precursor of Scala. My implementation illustrates the technique of |
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success continuations in proof search. |
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</TD> |
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<P><!-- Created: Tue Mar 4 00:23:25 GMT 1997 --> |
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<!-- hhmts start --> |
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Last modified: Fri Jan 6 18:44:51 GMT 2012 |
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