As far as I can tell, all distributions out there, including Fedora Extras, calls this package "python-numeric". Please consider changing the name to that, or at least adding the Provides: for Fedora Extras compatibility.
Sounds reasonable, though I don't know the history of why that's the case.
Thanks. I think "consistency" is the keyword of the answer to that "why" question. Also: http://fedoraproject.org/wiki/PackageNamingGuidelines#head-bb4665ea46aa0653710ab594efb3207a94eda636