Have you ever had a dream, Neo, that you seemed so sure it was real? But if were unable to wake up from that dream, how would you tell the difference between the dream world & the real world?
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This simple tool displays the norm of the difference of two wavefunctions, {$|| \; \psi_1 - \psi_2 \; ||$}
usage: mp-diff <psi1> <psi2>