Abstract
A necessary and sufficient condition is given so that in a domain Ω there are no functions whose average over all balls contained in Ω of radiir 1,r 2 vanish except the zero function.
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Partially supported by NSF grant DMS-8401356 and by NSF grant OJR 85-OV-108 through the Systems Research Center of the University of Maryland.
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Berenstein, C.A., Gay, R. A local version of the two-circles theorem. Israel J. Math. 55, 267–288 (1986). https://doi.org/10.1007/BF02765026
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DOI: https://doi.org/10.1007/BF02765026