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Mar 16, 2013 at 14:06 comment added Stefan Kohl @Marc: The OP asked for a proof of the implication "three squares theorem => four squares theorem" rather than for a proof of the three squares theorem.
Mar 16, 2013 at 13:42 comment added Marc van Leeuwen The page you linked to just proves the easy part of the three squares theorem.
Mar 16, 2013 at 13:31 history answered Stefan Kohl CC BY-SA 3.0