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asked 2010-09-25 08:34:50 -0600
http://en.wikipedia.org/wiki/Principal_branch
http://en.wikipedia.org/wiki/Exponentiation#Failure_of_power_and_logarithm_identities
updated 2011-04-28 11:26:37 -0600
updated 2011-04-28 11:27:57 -0600
updated 2011-06-16 08:03:37 -0600