... xµgµνxν= (x0) 2 − (x1) 2 − (x 2 ) 2 − (x3) 2 = t 2 − r 2 = t 2 −r 2 1−r 2 2−r 2 3(3.1.46)or, for the infinitesimally small vector dxµ,(dxµ) 2 = dxµgµνdxν= (dt) 2 − (dr) 2 . (3.1.47)In ... −→va(3.1 .21 ) and Hamiltonian (3.1.1) takes the following form in the limitH =L0dx1 2 p 2 (x, t) +v 2 ∂q∂x 2 + 2 0q 2 (x, t). (3.1 .22 )Now the degrees of freedom of the system are ... quantum-mechanicalsystems with a finite number of degrees offreedom obtained in chapter 2 (cf (2. 2.9) and (2. 2 .21 )):ϕ(t, r), t|ϕ0(t0, r), t0=ϕ(r)|e−i(t−t0)H|ϕ0(r)= limL→∞limK→∞a→0limN→∞ε→0Kk=1Nj=1∞−∞dϕj(rk)N+1j=1∞−∞dπj(rk) 2 ×exp{iSN(πi(rl),...