Maurits Joost Belinfante earned a PhD in maths in 1923 at the University of Amsterdam. He was a known checker player/composer.
The author Gerhard Durlacher met Belinfante in Theresiënstadt and wrote about him in his book Strepen aan de Hemel (Amsterdam 1985).
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For additional information on Maurits Joost Belinfante, see:
D. van Dalen, L.E.J. Brouwer. Een Biogra…