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A comment on Ask HN: Learning advanced math. Parent comment

Re:Ask HN: Learning advanced math by talbina on Sunday October 03, 2010 @03:44PM (#1753437)
Why are these books from Dover Publications so cheap?
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Re:Ask HN: Learning advanced math by pingswept on Sunday October 03, 2010 @03:55PM (#1753460)
Because the copyright has expired, or the copyright owner has put the work in the public domain due to bankruptcy, or similar.
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