Combinatorics, or at least part of it, is the art of counting. For example: how many derangements does a set with n n elements have? A derangement is a bijection with no fixed points. We’ll count them ...

On May 1, 2025, the Minneapolis City Council voted to expand civil rights protections, effective August 1, 2025. Under the ...

Using a notion called integer partitions, mathematicians have discovered a new way to detect prime numbers while also ...

The doubling of steel and aluminum tariffs by the Trump administration—from 25% to 50% within just three months—is a ...