Math is, by definition, a subject about numbers. But at the National Council of Teachers of Mathematics this week, math educators said the subject has its own language, too—and knowing how to speak it ...

As a math teacher, I have always taught my students that definitions are important. They must be precise and unambiguous. It is impossible to have a valid proof that will be accepted by others unless ...

When I tell someone I am a mathematician, one of the most curious common reactions is: “I really liked math class because everything was either right or wrong. There is no ambiguity or doubt.” I ...