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Larry Smith brings up another math thing that has changed in my
lifetime. When I went to school, sqrt(25) was plus-or-minus five.
Larry says it is now just plus five. My daughter concurs with Larry.
Like I said, I'm getting too old.
By the way. Why is this? Is it a calculator thing? Sometimes I think
math definitions are driven by what calculators do. I remember doing
sqrt on a slide rule (and also with pencil and paper using
newton-raphson) and my HS math teacher would take off a point if we
didn't put the +- sign in front of "the answer."