## UNIVERSITY OF PENNSYLVANIA

## Department of Mathematics

Fall 2007 -Hans Rademacher Lectures in Mathematics

Hendrik W. Lenstra

Mathematisch Instituut

Universiteit Leiden

will speak on

## Algorithms for ordered fields

One of the reasons ordered fields are interesting, is that one can write down a fairly explicit model of an algebraic closure of any ordered field. The series of lectures is devoted to a number of problems that one encounters if one wishes to make this model completely explicit and to design efficient algorithms for doing computations in the model.Monday....October 29, 2007....4:30pm....A8 DRL

Tuesday....October 30, 2007.....4:30pm...A8 DRL

Wednesday....October 31, 2007....4:30pm...A6 DRL

Thursday.....November 1, 2007....4:30pm...4C8 DRL

Previous Rademacher Lecturers

Lectures will be held in the David Rittenhouse Laboratory,

S.E. corner of 33rd and Walnut Streets, Philadelphia, PA.

Tea: 4E17 DRL at 4:00pm.For further information, please call the Department of Mathematics at the University of Pennsylvania - 215-898-8627.