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THE CRAMÉR–WOLD THEOREM ON QUADRATIC SURFACES AND HEISENBERG UNIQUENESS PAIRS

Part of: Nontrigonometric harmonic analysis

Published online by Cambridge University Press:  07 November 2017

Karlheinz Gröchenig  and
Philippe Jaming Open the ORCID record for Philippe Jaming [Opens in a new window]
Karlheinz Gröchenig
Affiliation:
Faculty of Mathematics, University of Vienna, Oskar-Morgenstern-Platz 1, A-1090 Vienna, Austria ([email protected])
Philippe Jaming
Affiliation:
Univ. Bordeaux, IMB, UMR 5251, F-33400 Talence, France CNRS, IMB, UMR 5251, F-33400 Talence, France ([email protected])
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Abstract

Two measurable sets $S,\unicode[STIX]{x1D6EC}\subseteq \mathbb{R}^{d}$ form a Heisenberg uniqueness pair, if every bounded measure $\unicode[STIX]{x1D707}$ with support in $S$ whose Fourier transform vanishes on $\unicode[STIX]{x1D6EC}$ must be zero. We show that a quadratic hypersurface and the union of two hyperplanes in general position form a Heisenberg uniqueness pair in $\mathbb{R}^{d}$. As a corollary we obtain a new, surprising version of the classical Cramér–Wold theorem: a bounded measure supported on a quadratic hypersurface is uniquely determined by its projections onto two generic hyperplanes (whereas an arbitrary measure requires the knowledge of a dense set of projections). We also give an application to the unique continuation of eigenfunctions of second-order PDEs with constant coefficients.

Keywords

uncertainty principleannihilating pairHeisenberg uniqueness pairCramér–Wold theorem

MSC classification

Primary: 42C20: Other transformations of harmonic type
Type
Research Article
Information
Journal of the Institute of Mathematics of Jussieu , Volume 19 , Issue 1 , January 2020 , pp. 117 - 135
Copyright
© Cambridge University Press 2017 

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