First, I do think that modelling is in the realm of physics, biology, etc. Mathematicians might make unambiguous statements about these, but they never claim that the model is a good representation of reality.
Second, Godel's incompleteness theorem is about incompleteness, not ambiguity. The statement x = y + 10 is unambiguous in the sense that all mathematicians would always interpret it in exactly the same way. There is no question that x = 12, y = 2 is consistent with that statement, and x=y is not.
Re:Why Math is deeper than Sociology [quote]
by anirbas on Monday September 17, 2007 @06:30AM
(#55621)
http://en.wikipedia.org/wiki/Godel%27s_incompleteness_theore... redirects to the right page.
The issue goes even deeper. You could argue that the above argument is a semantic trick, because modeling is outside the realm of maths as a science. But even the formal foundations are in doubt if you consider Goedels incompleteness theorems (http://en.wikipedia.org/wiki/GAXdel%27s_incompleteness_theor...)
Sorry, the link is broken. Apparently this forum doesn't support umlauts in URLs