36 citations · 106 across the 22 of their papers we have counts for
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Two random constructions inside lacunary sets
Stefan Neuwirth
We study the relationship between the growth rate of an integer sequence and harmonic and functional properties of the corresponding sequence of characters. In particular we show t…
Transfer of Fourier multipliers into Schur multipliers and sumsets in a discrete group
Stefan Neuwirth, Éric Ricard
We inspect the relationship between relative Fourier multipliers on noncommutative Lebesgue-Orlicz spaces of a discrete group and relative Toeplitz-Schur multipliers on Schatten-vo…
The maximum modulus of a trigonometric trinomial
Stefan Neuwirth
Let Lambda be a set of three integers and let C_Lambda be the space of 2pi-periodic functions with spectrum in Lambda endowed with the maximum modulus norm. We isolate the maximum…
Lacunary matrices
Asma Harcharras, Stefan Neuwirth, Krzysztof Oleszkiewicz
We study unconditional subsequences of the canonical basis e_rc of elementary matrices in the Schatten class S^p. They form the matrix counterpart to Rudin's Lambda(p) sets of inte…
Cycles and 1-unconditional matrices
Stefan Neuwirth
We characterize the 1-unconditional subsequences of the canonical basis (e_rc) of elementary matrices in the Schatten-von-Neumann class S^p . The set I of couples (r,c) must be the…
Metric unconditionality and Fourier analysis
Stefan Neuwirth
We investigate several aspects of almost 1-unconditionality. We characterize the metric unconditional approximation property UMAP in terms of ``block unconditionality''. Then we fo…