Jason Behrstock's Home Page



Department of Mathematics
Columbia University 
2990 Broadway, 
New York, NY 10027  
email: jason@math.columbia.edu 
Office: 627 Mathematics 
Phone: 212.854.9251  
Fax: 212.854.8962  
I'm the one upside down!

My primary interests are in geometric group theory and low dimensional topology.
My curriculum vitae and research statement (October 2007).


Spring 2008 Teaching:

Calc III, section 6

Papers:

(Available as PDF files, email me if you need an alternate format.)

•   Growth of intersection numbers for free group automorphisms, with M. Bestvina and M. Clay
      Preprint, June 2008.
•   Geometry and rigidity of mapping class groups, with B. Kleiner, Y. Minsky, and L. Mosher
      Preprint, January 2008.
•   Commensurability and QI classification of free products of finitely generated abelian groups, with T. Januszkiewicz and W. Neumann
      Proceedings of the American Mathematical Society, to appear.
•   Quasi-isometric classification of graph manifolds groups, with W. Neumann
      Duke Mathematical Journal, 141 (2): 217-240, 2008.
      Duke University Press online published version, subscription required.
•   Thick metric spaces, relative hyperbolicity, and quasi-isometric rigidity, with C. Drutu and L. Mosher
      Preprint, December 2005.
•   Dimension and rank for mapping class groups, with Yair Minsky
      Annals of Mathematics, 167: 1055-1077, 2008.
      Online published version.
•   Curve complexes and finite index subgroups of mapping class groups, with Dan Margalit.
      Geometriae Dedicata 118 (1): 71-85, 2006.
      Springer online published version, subscription required.
•   Asymptotic Geometry of the Mapping Class Group and Teichmuller Space
      (The last two sections of this paper contains new results not in the Ph.D. thesis.)
      This final published version is more current than the one at the arXiv.
      Geometry & Topology 10: 1523-1578, 2006.
•   Asymptotic Geometry of the Mapping Class Group and Teichmuller Space
      SUNY Stony Brook Ph.D. Thesis, May 2004.



Relevant seminars in New York City:

• Columbia Geometric Topology Seminar
• Magnus Seminar (Group Theory Seminar at CUNY Graduate Center)

Recent and upcoming conferences, which I intend to attend:

• Aug 2007 Berkeley - Introductory workshop on geometric group theory
• Aug 2007 Berkeley - Introductory workshop on Teichmuller Theory and Kleinian Groups
• Sept 2007 New York - Magnus' 100th birthyear
• Nov 2007 Berkeley - Research conference on geometric group theory

Misc

Kashi Behrstock's web page.
Pictures of my daughters: Kaia Sophia Behrstock and Ela Margaret Behrstock.
Pictures of friends.
Old web pages: http://www.math.sunysb.edu/~jabehr and http://www.math.utah.edu/~jason
This material is based upon work supported by the National Science Foundation under Grant No. 0604524
Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.