AMDG
I noticed the equals function in math.hpp. I'm not sure about it. If a and b are both greater than 1 than if their difference is non-zero, it cannot be less than epsilon (which is defined as "the difference between 1 and the least value greater than 1 that is representable" 18.2.1.2) Thus, the test is equivalent to a == b.
Also, the include guard is _GEOMETRY_MATH_HPP "Each name that [...] begins with an underscore followed by an uppercase letter (2.11) is reserved to the implementation for any use." (17.4.3.1.2)
In Christ, Steven Watanabe
Steven, The math.hpp contains things that should not be in this library, I would like to have them replaced by something in Boost, or maybe they are already in Boost but I overlooked them. I put them there to make it easy to change lateron, and it needs probably change indeed. Thanks. The include guards were thought to be preceded by something else... No problem to change them. Barend Gehrels Geodan, Amsterdam