00388nam a2200133Ia 45000010005000000030004000050050017000090080041000260400011000670410008000780820018000861000024001042450126001286619Ost20260507154939.0251113s9999||||xx |||||||||||||| ||eng||  cnitttr  aeng  a515.35bS43S   aSpiegel,  Murray R. 0aSchaum's outline of theory and problems of calculus of finite differences and difference equations. /cSpiegel, Murray R.