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math.FA2013
On the range of
Xinggang He, Chuntai Liu
Let be a sequence of complex numbers. In this paper we answer when the range of is dense or equal to the complex plane. Some examp…
math.FA2013
Spectrality of Self-Similar Tiles
Xiaoye Fu, Xinggang He, Ka-Sing Lau
We call a set with positive Lebesgue measure a {\it spectral set} if admits an exponential orthonormal basis. It was conjectured that is a sp…