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**Deveno** would you say, then, that mathematics is "fiction", albeit chosen by some sort of "best-fit" criterion?

it is my understanding (and i may be wrong, or perhaps merely misinformed), that at distances less than 1 planck length, quantum effects dominate, and the hesisenberg uncertainty principle meakes measurement impossible. moreover, in string theory, there simply aren't any shorter lengths. i'm no physicist, but apparently many people actually believe that this is the case; some even think that space-time is discrete (or perhaps, foamy-depends on who you talk to) at that scale.