Ok, so he's only number one in non-Euclidian geometry, but WOW, my Hilbert is outselling David Hilbert. Of course, why anyone would pay $2.99 for a Kindle version of Hilbert's Foundations of Geometry when it's available in pdf on Gutenberg is an interesting question.
Of course, why anyone would pay 99 cents for Hilbert's Happy Day when it's available for free at least one Wednesday a month is another interesting question. Two down, 21 more to go!
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