Trace minmax functions and the radical Laguerre–Pólya class
Trace minmax functions and the radical Laguerre–Pólya class
复制标题
求极小极大函数和激进的 LaguerreâPólya 类
DOI:
10.1007/s40687-021-00248-5
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发表时间:
2021
影响因子:
1.2
通讯作者:
Pascoe, J. E.
中科院分区:
文献类型:
--
作者:
Pascoe, J. E.
We classify functionswhich satisfy the inequality $$\begin{aligned} {\text {tr}}f(A)+f(C)\ge {\text {tr}}f(B)+f(D) \end{aligned}$$whenare self-adjoint matrices,, the so-calledtrace minmax functions.(Hereifis positive semidefinite, andfis evaluated via the functional calculus.) A function is trace minmax if and only if its derivative analytically continues to a self-map of the upper half plane. The negative exponential of a trace minmax functionsatisfies the inequality $$\begin{aligned} \det g(A) \det g(C)\le \det g(B) \det g(D) \end{aligned}$$forA,B,C,Das above. We call such functionsdeterminant isoperimetric. We show that determinant isoperimetric functions are in the “radical” of the Laguerre–Pólya class. We derive an integral representation for such functions which is essentially a continuous version of the Hadamard factorization for functions in the Laguerre–Pólya class. We apply our results to give some equivalent formulations of the Riemann hypothesis.
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