Properties of bound states of the Schrodinger equation with attractive Dirac delta potentials

We have studied bound states of the Schrodinger equation for an attractive potential with any finite number (P) of Dirac delta-functions in R-n where n = 1, 2, 3..... The potential is radially symmetric for n greater than or equal to 2 and is given as V(r) = -(h2)/(2m) Sigma(i=1)(P) sigma(i)delta(r - r(i)) where sigma(i) > 0, r(1) < r(2) < (...) 2l+n-2 and none otherwise. Wehave also proven that there are at most P positive roots for the equation X-22(k) = 0 where X = ((X21) (X11) (X22) (X12)) = MpMp-1...M-1 and M-i is an element of SL (2, R) are the particular where X = G21 X 22 transfer matrices mentioned above.