[williamstein]

"Users don't fix bugs in open source software." The serious research-mathematics users of Sage often do fix bugs in Sage, and contribute fixes back. This is one reason a typical Sage release has well over 100 contributors, and we have had overall about 500 contributors to Sage (see http://trac.sagemath.org/). There's a huge difference in programming skills between typical research mathematics Sage users and OpenOffice users, because all such Sage users are programmers, and the language they use to interact with Sage is the language it is mostly written in. Yes, Sage has subcomponents in other languages, but an enormous amount -- maybe the majority by now -- of Sage is in Python and Cython. Also, successful mathematicians are extremely intense and dogged in pursuing something they get passionate about. Often they will devote a decade or more to attacking a problem, so spending a few days learning Cython (say) and debugging code is relatively little time in comparison to the overall time they devote to a problem. Anyway, I'm glad that when I started Sage I didn't believe the statement "Users don't fix bugs in open source software" applies universally. I didn't know either way, so I waited to see, and was genuinely surprised at how false that statement actually is in the case of Sage.