Reciprocal polynomials with all zeros on the unit circle

Reciprocal polynomials with all zeros on the unit circle
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全零在单位圆上的倒数多项式

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发表时间:
2011
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通讯作者:
DoYong Kwon
DoYong Kwon
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文献类型:
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作者:
DoYong Kwon

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Let f(x)=adxd+ad−1xd−1+⋅⋅⋅+a0∈ℝ[x] be a reciprocal polynomial of degree d. We prove that if the coefficient vector (ad,ad−1,…,a0) or (ad−1,ad−2,…,a1) is close enough, in the l1-distance, to the constant vector (b,b,…,b)∈ℝd+1 or ℝd−1, then all of its zeros have moduli 1.