The derived set of the spectrum of a distribution function

Theodore Chihara
1970 Pacific Journal of Mathematics  
Let {a n }n=o and {b n }n=o be real sequences with b n > 0, δ Λ >O(τι-> oo). Let {P n (x)}n=o be the sequence of orthonormal polynomials satisfying the recurrence %P n {%) = b n -lPn-l(x) + a n P n (x) + b n Pn+l(x) , fa ^ 0) ,
doi:10.2140/pjm.1970.35.571 fatcat:5as2lnswuncs3ebbgqr7eflawa