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For questions about mathematical problems arising from physics, the natural science studying general properties of matter, radiation and energy.

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Mathematical explanation of the failure to quantize gravity naively

And indeed, in most circumstances, we know the classical physics, and are trying to find a quantum theory that reproduces it. … So we'll try something else: make the coupling constants in the microscopic action depend on the lattice spacing, and hope that we can tune them in a way that keeps the classical physics fixed. …
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