Combining Riesz bases in $\mathbb R^d$

Combining Riesz bases in $R^{d}$

Gady Kozma
Weizmann Institute of Science, Rehovot, Israel
Shahaf Nitzan
Georgia Institute of Technology, Atlanta, USA
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$Combining Riesz bases in $\mathbb R^d$ cover$

We prove that every finite union of rectangles with edges parallel to the axes in $R^{d}$ admits a Riesz basis of exponentials.

Gady Kozma, Shahaf Nitzan, Combining Riesz bases in $R^{d}$ . Rev. Mat. Iberoam. 32 (2016), no. 4, pp. 1393–1406