= Vacuum-subtracted soliton mass
{title2=$M=E_{Q=1}-E_{Q=0}$}
The rest mass of a stable <soliton> is the lowest energy in its <topological sector> minus the vacuum energy, in the infinite-volume limit. If Euclidean kernels $K_Q(\tau)$ have nonzero overlap with the sector's lowest-energy states, then $M=-\lim_{\tau\to\infty}\tau^{-1}\log[K_1(\tau)/K_0(\tau)]$, followed by the infinite-volume limit. A <Euclidean path integral> represents these kernels, with boundary wavefunctionals included if necessary.
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