The following is an excerpt from Beyond Infinity: An Expedition to the Outer Limits of Mathematics, by Eugenia Cheng Mathematics can be thought of as many things: a language, a tool, a game. It might ...

The other day, my four-year-old son asked me, point blank: —Dad, can you count to infinity? —No son, you can't, it would take forever. —But what's infinity minus three?" —It's infinity, too. —But how ...