Julian Holstein


	I am a College Lecturer and Fellow elect of Christ's College. When not at Christ's I can usually be found at the Department of Pure Mathematics and Mathematical Statistics at the University of Cambridge, where I am working on my PhD with Ian Grojnowski. Before I joined Christ's I was a student at St John's College.
Contact	Julian VS Holstein Room E0.16 Centre for Mathematical Sciences Wilberforce Road Cambridge CB3 0WB Telephone: +44 1223 765882 Email: J.V.S.Holstein, dpmms.cam.ac.uk
Research	My main interest is algebraic geometry and its relations to other bits of mathematics, in particular topology and higher category theory. For a while I have been interested in ways to study the topology of algebraic varieties. My part III essay Cochains is a very short introduction to rational homotopy theory. It is mainly concerned with the theorem that "rational homotopy is very algebraic". In other words there is an equivalence of the homotopy category of (reasonably nice) rational spaces and certain commutative differential graded algebras called minimal models.
Teaching	Since 2008 I have been running pure maths examples classes for first years. Some information on these classes and undergraduate maths in general can be found here. Other courses I taught and will teach soon are Algebraic Geometry, Geometry, Analysis II, Linear Algebra and Numbers & Sets. I have also been a group leader at the Part III Seminar Series, and talked in the Archimedeans' SU(2) series. (Where SU(2) stands for "seminars for undergraduates, too".)
Young Researchers in Maths	From 16 to 18 April 2009 a novel event happened in Cambridge. For two days 200 young researchers from all areas of mathematics took over the CMS. Visit the website to reminisce or find out what you missed. There were two follow-up event in 2010 in Cambridge and 2011 in Warwick which you can learn about at the links. Plans for Young Researchers in Maths 2012 in Bristol are underway. The aim of Young Researchers in Maths is to improve contacts between PhD students and other early career mathematicians. If you are interested in running one of these events in the future or have other ideas how to get young mathematicians together, please get involved by getting in contact with the current comittee (or write to me and I'll point you in the right direction).
Quotes	In celebration of the less serious aspects of the Cambridge math tripos here is a fine collection of lecturer quotes. Some more gems can be found on these sites. Some other sites have sadly disappeared (in particular the Imre Leader Appreciation society and one page that collected the highlights of Matthias Dörrzapf's first Vector Calculus course).
Other	In my nonmathematical life I love improvised theatre, that is, theatre without a script, without a director, without any idea what is going to happen on stage in the next minute. I am currently a member of ICE and in the past I have taught some wokshops at summer schools, including a full one week course at the CdE Sommerakademie 2007. My mother is Susannne Holstein, she is an artist.