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From: laura@utcsstat.UUCP (Laura Creighton)
Newsgroups: net.math
Subject: Re: -1 = 1
Message-ID: <1043@utcsstat.UUCP>
Date: Sat, 10-Sep-83 16:32:24 EDT
Article-I.D.: utcsstat.1043
Posted: Sat Sep 10 16:32:24 1983
Date-Received: Sat, 10-Sep-83 17:37:02 EDT
References: <734@bronze.UUCP>
Organization: U. of Toronto, Canada
Lines: 10

you cannot take the square root of something in that way. You have
to split your question instead.  

if k**2 is 16, thn you have to say that k is + or - the square root of 16.
thus k is +4 or k is -4. In the same way with your question, you prove
that 1 = 1 or 1 = -1. While the second statement is false, the union
of them is true.

Laura Creighton
utzoo!utcsstat!laura