  For certain systems, the N-particle ground-state wavefunctions of the bulk
happen to be exactly equal to the N-point space-time correlation functions at
the edge, in the infrared limit. We show why this had to be so for a class of
topological superconductors, beginning with the p+ip state in D=2+1. Varying
the chemical potential as a function of Euclidean time between weak and strong
pairing states is shown to extract the wavefunction. Then a Euclidean rotation
that exchanges time and space and approximate Lorentz invariance lead to the
edge connection. We illustrate straightforward extension to other dimensions
(eg. 3He- B phase in D=3+1) and to correlated states like fractionalized
topological superconductors.
