Packages in the Applications/Mathematics group of the devel repository (base development repository [unstable]):
bc: GNU interactive algebraic language
glpk: GNU Linear Programming Kit
gnuplot: Commandline driven interactive datafile and function plotting utility
octave: A highlevel language, primarily intended for numerical computations
pari: Number Theoryoriented Computer Algebra System
R: R is a free software environment for statistical computing and graphics
Routliers: A collection of some tests commonly used for identifying outliers.
