536 BC -- The biblical Daniel receives an angelic visitor. see Daniel 10:4 (http://bible.gospelcom.net/cgi-bin/bible?passage=daniel+10%3A4&language=english&version=NLT)
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... be understood as "either of those element(s) of the field whose square equals b2 - 4ac". In some fields, some elements have no square roots and some have two; only zero ...