Operator-theoretic Borel-series zero conjecture

From papers

Let {zn}nN\{z_n\}_{n\in\mathbb{N}} be distinct points in the open unit disk converging to 11. Let H\mathcal{H} be a separable infinite-dimensional complex Hilbert space with orthonormal basis {en}nN\{\mathbf e_n\}_{n\in\mathbb{N}}, and let AA be the bounded normal operator defined by Aen=znenA\mathbf e_n=z_n\mathbf e_n. If PP is a bounded operator on H\mathcal{H} such that IPI-P is a rank-one orthoprojection, then the compression PAPPHPAP|_{P\mathcal{H}} has infinite point spectrum. Operator-theoretic Borel-series zero conjecture. Under these hypotheses, the stated compression has infinitely many eigenvalues. The source says this is equivalent to the preceding Borel-series conjecture after normalization, while a later remark discusses possible relaxations; no resolution is given.

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Sources & referencesView supporting material

Primary source

Julius Borcea, “Equilibrium points of logarithmic potentials induced by positive charge distributions. I. Generalized de Bruijn-Springer relations”, arXiv:math/0601519 (2006).

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