We recently wrote about how infinitely large sets are not all the same size as each other, but we were a bit vague about what we meant by a set. The people who invented set theory also started out ...

Katie has a PhD in maths, specializing in the intersection of dynamical systems and number theory. She reports on topics from maths and history to society and animals. Katie has a PhD in maths, ...

One of the strangest results in mathematics explains how it’s possible to turn one sphere into two identical copies, simply by rearranging its pieces. Imagine two friends hiking in the woods. They ...

You're currently following this author! Want to unfollow? Unsubscribe via the link in your email. We recently wrote about how infinitely large sets are not all the same size as each other, but we were ...