  Among perhaps many things common to Kuratowski's Theorem in graph theory,
Reidemeister's Theorem in topology, and Cook's Theorem in theoretical computer
science is this: all belong to the phenomenon of simultaneous discovery in
mathematics. We are interested to know whether this phenomenon, and its close
cousin repeated discovery, give rise to meaningful questions regarding causes,
trends, categories, etc. With this in view we unearth many more examples, find
some tenuous connections and draw some tentative conclusions.
