Thursday, 5 February 2015

fake proofs - Square root of 1 is (not) -1











I was thinking on the following line of thoughts:
1=1=11=11=i2=1



Of course this is not true, but I was wondering which step in this 'line of thoughts' is forbidden to make?



Thanks for the explanation.



Answer



11 is not equal to 11. The formula ab=ab is only valid when both a,b are nonnegative real numbers.


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