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cousin_it comments on Difference between CDT and ADT/UDT as constant programs - Less Wrong
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Don't you need a theorem prover to go from commutativity of addition to f()+g()==g()+f()? I thought you were supposed to use only evaluations and source code comparisons on the code f()+g()==g()+f() directly...
Commutativity of addition is a correlation P1=P2, where P1(x,y)=x+y, and P2(x,y)=y+x.
So, f()+g() = [using this correlation] = g()+f().
But you're right. In order to use this, I have to be able to calculate evaluations and comparisons on arbitrary pieces of code, not just the ones existing in U()...