About twenty years ago, Olgur Celikbas attended a conference on algebra in Turkey. He and his then girlfriend, Ela Özçağlar, had recently graduated from college in Ankara; both had studied math. At ...

Space to play or pause, M to mute, left and right arrows to seek, up and down arrows for volume. Hey mathematicians! My name's Ms Szalek and welcome to maths. Today we're going to focus on ...