To a nonmathematician, having the letter "i" represent a number that does not quite exist and is "imaginary" can be hard to ...

In the late 19th century, Karl Weierstrass invented a fractal-like function that was decried as nothing less than a “deplorable evil.” In time, it would transform the foundations of mathematics.

For instance, when it came time recently to build a lesson about fractions, Fisher had students ... That’s the result of a push to make math more playful over the past few decades, she says. When ...

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