-- Feynman and Hibbs problem 3-5 K0 = sqrt(m / 2 / pi / i / hbar / (t - tc)) * exp(i m (x - xc)^2 / 2 / hbar / (t - tc)) K = K0 psi(xc,tc) d(K,t) == -i / hbar (-hbar^2 / 2 / m d(K,x,x)) Run