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Division by zero is undefined!

A rather confused discussion of this statement appeared recently on Here is my take on things: Division by zero is undefined whether you work with real numbers or complex numbers. Khan’s video on the subject is a bit confusing. The consistent exposition of algebra is given in Euler’s “Elements of algebra”.  There division is defined by saying that a/b=x, a unique […]

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Timely Feedback

Many worry these days about providing students with a meaningful and timely feedback.  Many try using modern technology – audio feedback and such.    While very useful sometimes  such approaches can be very time-consuming and not necessarily better than a time-honoured and low tech solution – the Socratic dialogue.   Most teachers I know think […]

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