Abstract
A short proof is given of the theorem by Wik, who, in 1965, showed that the nowhere-dense strong Ditkin subsets ofT, the circle group, are finite.
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Rosenthal, H.P. On the existence of approximate identities in ideals of group algebras. Ark. Mat. 7, 185–191 (1967). https://doi.org/10.1007/BF02591035
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DOI: https://doi.org/10.1007/BF02591035