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Why there can't be infinitely small existing?

I am not suggesting it can or cannot. I am asking can there be an absolute or reasonable answer to that question.

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This is the same question as physics.stackexchange.com/questions/64126/… asked in a different way. The answer to "what is the smallest thing theoretically" answers "why can't something be infinitely small". –  Brandon Enright May 10 '13 at 21:52
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No it doesn't. Can't you see the difference? –  noarm May 10 '13 at 22:00
    
@BrandonEnright: The answer there would have to explain the QM concepts involved if it were to answer this question. The questions aren't exactly dupes (I agree that the answers will be similar), so I'm not closing this for now. I suggest you that answer and explain the fuzzy nature of QM in an answer there :) –  Manishearth May 11 '13 at 6:16

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