Trajectories of the zeros of hypergeometric polynomials F(−n, b; 2b; z) for b < − 1/2
Trajectories of the zeros of hypergeometric polynomials F(−n, b; 2b; z) for b < − 1/2
复制标题
超几何多项式 F(−n, b; 2b; z) 的零点轨迹(b < − 1/2)
DOI:
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发表时间:
2001
期刊:
影响因子:
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通讯作者:
P. Duren
中科院分区:
文献类型:
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作者:
K. Driver;P. Duren
In a previous paper [2] we studied the zeros of hypergeometric polynomials F(−n, b; 2b; z), where b is a real parameter. Making connections with ultraspherical polynomials, we showed that for b > − 1/2 all zeros of F(−n, b; 2b; z) lie on the circle ¦z − 1¦ = 1, while for b < 1 − n all zeros are real and greater than 1. Our purpose now is to describe the trajectories of the zeros as b descends below the critical value − 1/2 to 1 − n. The results have counterparts for ultraspherical polynomials and may be said to “explain” the classical formulas of Hilbert and Klein for the number of zeros of Jacobi polynomials in various intervals of the real axis. These applications and others are discussed in a further paper [3].