Knot Theory
Playing with strings Knot theory is one of those topics where you start out by asking a very simple and natural question, follow a thread (hehe), then look around you and realize you’re knee-deep in at least 5 fields of math. The central topic of interest within knot theory is - you guessed it - knots. A knot in this context can be thought of as just a piece of string that is attached together at the ends. So if you feel like it, go and grab a piece of string lying around your house, or cut open a rubber band or whatever. It’s literally all you need. ...