Summer School in Semantics (at BRICS, Aarhus University, Denmark) and in particular the course about category theory there, was the cause of this game. For 2 or more players. One of the designers is Olle Möller. A very abstract card game. The cards are annotated with deep mathematical truth, taken from "category theory", which is a field even considered esoteric by some mathematicians.
The official site for this abstract mathematical card game. You can download the deck as a gzipped postscript.
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