> His style is so rigorous that he is known for the Coase Theorem, an idea that he posited without a single word of mathematics but that is as fundamental as ma

> His style is so rigorous that he is known for the Coase Theorem, an idea that he posited without a single word of mathematics but that is as fundamental as many things written in mathematics. ? How can it be both a theorem, and not mathematics? That seems like a contradiction to me.