Interactive applets

Turn statements in words into symbols and back again, see the converse, contrapositive and negation, and check your own translation.

Every symbol used in the Proof topic. Select a symbol to see what it means, how to read it aloud, and worked examples of how it is used.

Paste an induction question and the coach reads it, picks the starting value and step, then shows how to set out each part. It never does the algebra for you.

Explore loci on the Argand diagram: circles, perpendicular bisectors, rays and regions. Change the conditions and watch the picture change.