The area inside of a circle equals the radius times half the circumference, until somebody proves otherwise. As far as I know, nobody has proven otherwise.
pi is a consequence of Linear Euclidian geometric logic. The Universe is non Euclidian as demonstrated by experimental relativism, so although it is a good approximation to the purest form of logical thinking with pi being the ratio of the diameter to a circular circumference this isn't necessarily true in a real universe or multiverse (what ever a multiverse actually means)
http://www.fisica.net/relatividade/the_n...cott_walter.pdfhttp://en.wikipedia.org/wiki/Dirac_large_numbers_hypothesisThey all end up playing
Numberwang 
The earth rotates around the sun, until somebody proves otherwise. As far as I know, nobody has proven otherwise.
Only if your a mathematical reductionist, there is plenty of observational evidence to suggest otherwise. Galileo Galilei thought he was being clever. Nearly cost him his life
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