John, I have some trouble getting the Math Toolkit to work. I downloaded Boost 1.35, using CVS with the path -d:pserver:anonymous@boost.cvs.sourceforge.net:/cvsroot/boost, as described on the Boost home page. I selected the HEAD branch. This version did not include the Math Toolkit. (Did I download the right version?) So then I downloaded the Math Toolkit from the Vault, and combined the two source trees. I included the header boost/math/distributions/fisher_f.hpp in my code. I compiled the code with VC 7.1. I got the following error: ../Boost\boost\math\special_functions\log1p.hpp(195) : error C2785: 'tools::promote_args<T>::type boost::math::log1p(T)' and 'double boost::math::log1p(double)' have different return types ../Boost\boost\math\special_functions\math_fwd.hpp(246) : see declaration of 'boost::math::log1p' ../Boost\boost\math\special_functions\log1p.hpp(182) : see declaration of 'boost::math::log1p' ../Boost\boost\math\special_functions\log1p.hpp(195) : error C2912: explicit specialization; 'double boost::math::log1p<double>(double)' is not a specialization of a function template ../Boost\boost\math\special_functions\log1p.hpp(183) : fatal error C1903: unable to recover from previous error(s); stopping compilation Thank you, Johan