A message from UC Berkeley (exact situation unknown):
Warning: Due to a known bug, the default Linux document viewer evince prints N*N copies of a PDF file when N copies requested. As a workaround, use Adobe Reader acroread for printing multiple copies of PDF documents, or use the fact that every natural number is a sum of at most four squares.
haha... it took me some seconds to realise that it is a joke...
回覆刪除Haha, I just made this a question for my students who are taking complex analysis (they'll cover this theorem).
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