Hi all,(adsbygoogle = window.adsbygoogle || []).push({});

I want to buy my mathematics professor (who is also my adviser) a gift as a token of my gratitude for his hard work. Do you have a favorite math trinket/toy that you would recommend?

Note: He loves abstract math. His dissertation was in topology.

Thank you!

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# Your favorite (afforadable) math trinkets?

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