.. _dd: ==================== Domain Decomposition ==================== blah This is an equation as a separate call out: .. math:: \frac{ \sum_{t=0}^{N}f(t,k) }{N} and this is an equation inlined: :math:`\frac{ \sum_{t=0}^{N}f(t,k) }{N}`. Be careful about the number of returns with callouts!