Mark M. answered 02/14/18
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The verb is πυθαγορίζω (infinitive πυθαγορίζειν), formed by adding the derivative suffix -ιζω to the name of Pythagoras (Πυθαγόρας). So it just means "to be [or, in the context you quote, presumably, to act as] a disciple of Pythagoras"; or, to use an English equivalent, "to Pythagorize".
From:
https://mathoverflow.net/
Kenneth S.
02/14/18