Fredrik Johansson's website

General information and useful links:

• My email address: fredrik.johansson@gmail.com
• My blog
• My GitHub account
• My work page at RISC

Mathematical software I've worked on:

• mpmath (main author, 2007–) - a Python library for arbitrary-precision floating-point arithmetic with very extensive support (similar to Mathematica and Maple) for high-precision numerical approximation of special functions, integrals, series, etc.
• FLINT (contributor, 2010–) - a very fast C library for computational number theory. My work includes power series arithmetic, linear algebra, special functions, and a few other features.
• Sage (contributor, 2009–) - a project to create a free/open source alternative to Magma, Maple, Mathematica and Matlab. My main contribution has been to integrate mpmath and write Cython extension code to make mpmath faster.
• SymPy (contributor, 2007–) - a Python library for symbolic computations. I've worked on various modules (special functions, number theory, statistics, physics...) as well as core symbolics and arithmetic (mpmath began its life as a SymPy module).

Other stuff:

• My Doom maps and related information