This does look to me like a good idea, but to remain coherent, all of http://www.boost.org/doc/libs/1_57_0/libs/math/doc/html/gcd_lcm.html should move, which means: common_factor.hpp common_factor_rt.hpp common_factor_ct.hpp Plus docs and tests. Further I'd like to see the headers under boost/integer/*.hpp and the namespace changed to boost::integer. For backwards compatibility the boost/math/*.hpp headers should be present also but merely include the new ones and import the symbols into boost::math via using declarations. One SNAFU I see is that boost.integer is a largely unmaintained ragbag of utilities (though often very useful). It would be nice if someone would take responsibility for this library: any takers? It might be the right time too to move the rest of Boost.Integer into boost::integer rather than dumping everything in namespace boost? And finally to provide a "soft landing" for existing users, the Math lib docs should retain a stub page for these utilities that points to the new docs - Paul and I can take care of that one. Does that look like a plan? Anyone care to take it on? Best, John.