Did you know that Lawvere did classified work on arms control in the 1960s, back when he was writing his thesis? You can read more here: Yes, that’s right. For technical reasons the n-Category Café ...

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July 2025's Entries 2-Rig Conjectures Proved? Kevin Coloumbier has come out with a paper claiming to prove some conjectures on 2-rigs that Todd Trimble, Joe Moeller and I made. Lawvere’s Work on Arms ...

How do you count rooted planar n -ary trees with some number of leaves? For n = 2 this puzzle leads to the Catalan numbers. These are so fascinating that the combinatorist Richard Stanley wrote a ...