Regularity of the inversion problem for the Sturm-Liouville difference equation IV. Stability conditions for a three-point difference scheme with non-negative coefficients
1. Department of Mathematics and Computer Science , Ben-Gurion University of the Negev , P.O.B. 653, Beer-Sheva, 84105, Israel;2. Department of Mathematics and Statistics , Bar-Ilan University , 52900, Ramat Gan, Israel