Teacher2Teacher Q&A #3893

Dividing by zero

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From: Pat Ballew (for Teacher2Teacher Service)
Date: May 08, 2000 at 18:06:17
Subject: Re: Dividing by zero

I am not sure what the exact question is, but it seems that two things are being confused here... 1) If we ask for the solution to a problem that does not have a solution (solve x=x+3) we often say the solution set is the null set or empty set (this goes back to the reform after sputnik when all solutions were written as sets and most problems were written in set theoretic notation). When we ask for the evaluation of a function and the point where it is not continuous, we do not normally use any such language. We may say the function is not defined at that point. Contrast for the student that in one case we are evaluating an expression (and can not) and in the other we are solving an equation (and can not). I hope this helps, certainly it is hard for students to sort out some of the language, especially when it is not always consistent, but this is one of those places where the fine art of keeping separate things separate should be emphasized. -Pat Ballew, for the Teacher2Teacher service Visit us again at http://mathforum.com/t2t/

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