P. Zitt

activity

20062025

most citedEfficient and fast estimation of the geometric median in Hilbert spaces with an averaged stochastic gradient algorithm

104 citations · 414 across the 30 of their papers we have counts for

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3 papers · 1 filter

math.SP2024

Transformations preserving the effective spectral radius of a matrix

Jean-François Delmas, Dylan Dronnier, Pierre-André Zitt

We discuss transformations on matrices that preserve the effective spectrum and/or the effective spectral radius.

math.SP2023★ 1 cited

Atoms and associated spectral properties for positive operators on L^p

Jean-François Delmas, Kacem Lefki, Pierre-André Zitt

Inspired by Schwartz, Jang-Lewis and Victory, who study in particular generalizations of triangularizations of matrices to operators, we shall give for positive operators on Lebesg…

math.SP2008

Resonances for a diffusion with small noise

Markus Klein, Pierre-André Zitt

We study resonances for the generator of a diffusion with small noise in $R^{d}$ : $L_{ε} = - ε Δ + \nabla F \cdot \nabla$ , when the potential F grows slowly at infinity (typically as a sq…