libgsl-dev - 2.6+dfsg-2 main

The GNU Scientific Library (GSL) is a collection of routines for
numerical analysis. The routines are written from scratch by the GSL
team in C, and present a modern API for C programmers, while allowing
wrappers to be written for very high level languages.
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This package contains the header files, static libraries and symbolic
links that developers using GNU GSL will need.
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URL: http://www.gnu.org/software/gsl/