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Forum URL: http://www.cut-the-knot.org/cgi-bin/dcforum/forumctk.cgi
Forum Name: High school
Topic ID: 272
Message ID: 0
#0, Imaginary Numbers
Posted by Nate on Feb-07-04 at 03:39 PM
Hi, everyone. What's wrong with the following proof that 1 = -1:

1 = sqrt(1) = sqrt(-1 * -1) = sqrt(-1) * sqrt(-1) = i * i = -1

Thanks.