Well from my completely ignorant point of view: I always thought that the "mathematics of the universe" is a real thing waiting to be discovered, but how can you be sure that you have actually got it right? We may have a theory that seems right, but that doesn't mean that somehow someday it wont be contradicted. So we "invent maths" in the hope that we've worked out the real maths, but how do you know that you have found a fundamental truth/fact? So we just go with what we've worked out and change it as the need arises, never being quite sure. But it's better than sitting at home watching the grass grow. (Unless you really like grass that is)
I hope I just made sense.
Shane
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