5Z The basics of quantum mechanics r I--r\ /iI \ /f \ lt X,L -- !_t t I I /l t t I \ j ! 7 f_'.lI { t=Id o.E E t,.o li..- .-{ ^ _0.1 = -t {\ 6lIvi u.l0^060.i04(1.-l()l0(1. I-0: 1.6t.l J0N { t: .\ I t: .=: 0.61).1 At r: 0' this function clearly reduces to that u,ritten earlier for v(r.0).