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.

Clarification: This story has been updated to clarify that tests are mandated in most Advanced Placement courses. When students set to take Precalculus Honors return to school this fall in the ...

The familiar, hierarchical sequence of math instruction starts with counting, followed by addition and subtraction, then multiplication and division. The computational set expands to include bigger ...