"The page of my notebook was filled with many messy integrals, but all of a sudden I saw emerge a formula for counting. I had begun to calculate a quantity on the assumption that the result was a real number, but found instead that, in certain units, all the possible answers would be integers. This meant that areas and volumes cannot take any value, but come in multiples of fixed units."

Source : Lee Smolin (2008). “Three Roads To Quantum Gravity”, p.106, Hachette UK

Lee Smolin

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