A set of the six sides of a die matches up one-to-one with a set of red shoes, helping illustrate Georg Cantor's set theorem. Image courtesy of GBH/NOVA It can be easy to take math for granted. But ...

Is there an infinity of infinities? The question sounds almost absurd, like a child’s riddle meant to twist your brain into ...

I met a fellow math professor at a conference several weeks ago who is teaching a class on the idea of infinity. He told me of a story he tells his class about how difficult the idea of "infinity" can ...