English: A sum over possible topologies of an orientable compact 2-manifold, indexed by genus.
It is understood that this expression means summing contributions to an object, such as a partition function, that is expressed as a path-integral over possible geometries.
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.