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[HM] Principal square root
Posted:
Aug 28, 2005 5:33 PM


Dear all,
For me it is natural to say that the square root of a nonnegative real number is nonnegative. That is the common way to define "square root" in Sweden. In basic American textbooks I have noticed that the square root might be defined as both positive or negative followed by a definition of the nonnegative root as the "principal" square root. I am interested to know more about how you from all over the world define the word "square root".
I suppose that all of you define the symbolic expression Va (I mean \sqrt a) as a nonnegative number. But I am not sure. In one of the books I studied I found V9=3D+/3. For me that is wrong and I would give the student a square root sign (error symbol) in the margin.
Best greetings from peaceful Skebobruk
Staffan Rodhe



