The Unapologetic Mathematician

Mathematics for the interested outsider

Duality terminology

I should have mentioned this before, but usually dual notions are marked by the prefix “co-“. As an example, we have “well-powered” and “co-well-powered” categories.

Another example: We know through Erdős that “a mathematician is a device for turning coffee into theorems”. It thus follows by duality that a comathematician is a device for turning cotheorems into ffee.

May 31, 2007 - Posted by | Category theory


  1. And of course, we have commutative algebras and mmutative coalgebras.

    Comment by Mikael Johansson | June 1, 2007 | Reply

  2. […] This of course was taken from elsewhere, namely The Unapologetic Mathematician. […]

    Pingback by Plied Higher and Deeper « Insert Title Here | June 2, 2007 | Reply

  3. In aviation, shouldn’t then the copilot just make the trip back home?

    Comment by budapedestrian | January 27, 2010 | Reply

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