Your package sagemath failed to build from source in current rawhide. http://koji.fedoraproject.org/koji/taskinfo?taskID=5768316 For details on mass rebuild see https://fedoraproject.org/wiki/Fedora_20_Mass_Rebuild
Package has been built in rawhide. Currently only command line is functional, unless using a one line system wide patch, to have the notebook functional: $ diff -u /usr/lib/python2.7/site-packages/flask/app.py{.orig,} --- /usr/lib/python2.7/site-packages/flask/app.py.orig 2013-08-10 09:35:40.048836187 -0300 +++ /usr/lib/python2.7/site-packages/flask/app.py 2013-08-10 09:36:44.685838662 -0300 @@ -979,7 +979,7 @@ self.url_map.add(rule) if view_func is not None: old_func = self.view_functions.get(endpoint) - if old_func is not None and old_func != view_func: + if old_func is not None and old_func is not view_func: raise AssertionError('View function mapping is overwriting an ' 'existing endpoint function: %s' % endpoint) self.view_functions[endpoint] = view_func problem reported in python-flask bug https://bugzilla.redhat.com/show_bug.cgi?id=995716