On the number of zeros of certain rational harmonic functions
On the number of zeros of certain rational harmonic functions
复制标题
关于某些有理调和函数的零点个数
DOI:
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发表时间:
2004
期刊:
影响因子:
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通讯作者:
Genevra Neumann
中科院分区:
文献类型:
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作者:
D. Khavinson;Genevra Neumann
Extending a result of Khavinson and Swiatek (2003) we show that the rational harmonic function r(z) - z, where r(z) is a rational function of degree n > 1, has no more than 5n - 5 complex zeros. Applications to gravitational lensing are discussed. In particular, this result settles a conjecture by Rhie concerning the maximum number of lensed images due to an n-point gravitational lens.