= Configuration-space path integral
{title2=$K(q_f,q_i)=\int_{q_i}^{q_f}\mathcal Dq\,e^{iS[q]}$}
A <configuration-space path integral> integrates histories of the coordinates with weight $e^{iS}$. Fixed endpoint conditions specify a transition amplitude. For a quadratic kinetic energy it follows by Gaussian momentum integration from the <phase-space path integral>. Time-slicing fixes the normalization, and a regulator gives meaning to the otherwise formal <functional measure>.
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