How about Arne Beurling? Complex and harmonic analysis on the "very abstract" side, breaking nazi codes on the "very applied". See https://en.wikipedia.org/wiki/Arne_Beurling and https://bookstore.ams.org/SWCRY/
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How about Arne Beurling? Complex and harmonic analysis on the "very abstract" side, breaking nazi codes on the "very applied". See https://en.wikipedia.org/wiki/Arne_Beurling and https://bookstore.ams.org/SWCRY/