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It was told in "21" movie that Cauchy was accused by his student Vladimir Stupnitsky that Cauchy stole his equation. But I googled nothing about such a person.

Is this story fictional or not?

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up vote 2 down vote accepted

According to a transcript of the film, Rosa first mentions Vladimir Stupnitsky as Ben's disguise. He later uses the pseudonym to send a code to Ben to define their (non) relationship. So, no, Rosa made the story up, using names only the blackjack group could understand to send a message to Ben.

21 Script on Script O Rama

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