On the functional equation $f(x+y)f(x-y)=f^2(x)-f^2 (y)$
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Publication:3276883
DOI10.4064/AP-10-1-1-5zbMath0097.32101OpenAlexW760197553MaRDI QIDQ3276883
Publication date: 1961
Published in: Annales Polonici Mathematici (Search for Journal in Brave)
Full work available at URL: https://eudml.org/doc/208125
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