Responding to Success Machine:

>Without physical things to measure, there would be no math. On the other
>hand, physical things have to behave logically, which is mathematical.

Is quantum theory logical? Sure the mathematical process behind quantum theory is perfectly logical but are the initial assumptions of treating everything as a probability flux logical. The Schroedinger equation was postulated. The results of the Schroedinger match extremely well to experimental data and thus vindicates the initial postulate. I prefer to see the Laws of Physics as a sort of filter. Our universe is imposed upon a form of chaos that has no meaning in time and space while also representing all possible states of being. The Laws of Physics exclude most of the information that this chaos presents. What's left is what we see as space, its contents and causation. Quantum theory simply gets down to the nitty gritty of chaos which is why it's so difficult to understand. Once you're down to that level, our everyday notions of logic cease to be meaningful.

>Pi is the circumference-to-diameter ratio of a circle. That's the simplest
>definition.

Provided the circle is on a flat surface (Euclidean geometry). If the circle is on the surface of a sphere, e.g. the Earth's surface, then the ratio is not Pi. Space time is not flat thus raising the issue of whether or not Pi is a physically meaningful number when calculated to extreme accurracy. However I suspect through intuition that the principle represented by the mathematical abstraction of Pi does have physical meaning and might be the engine that drives causation.

Gary