# Categorifying Fundamental Physics

A fundamental fact about quantum theory is that these operators fail to commute: aa* – a*a = 1 in units where Planck’s constant is 1. Remarkably, this fact has a simple combinatorial interpretation: there is one more way to add an element to a finite set and then remove one, than to remove one and then add one.

— Categorifying Fundamental Physics, John Baez

2010.01.06 Wednesday ACHK

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— Michel de Montaigne

“Teaching is not filling a vase, but lighting a fire.”

“Teaching is not filling a vase, but lightning a fire.”

— Me@2005

— Me@2010.01.05

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2010.01.06 Wednesday $copyright ACHK$