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Johann Radon
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<p>Johann Karl August Radon was an <a href="/facts/Austria/4qWIMIyc">Austrian</a> <a href="/facts/Mathematician/eaFSR8Fx">mathematician</a>. His doctoral dissertation was on the <a href="/facts/Calculus_of_variations/Ya5Lsma3">calculus of variations</a> (in 1910, at the <a href="/facts/University_of_Vienna/sc4vUUe8">University of Vienna</a>). </p>