Is M381 True or False ?

In facebook I have a photo album with mathematics related pictures. Sometime ago I added the picture below. I thought it was a joke...

... but I could not have been further from the truth. The picture could have been taken at any Open University M381 tutorial. This student is not clueless, on the contrary: he contemplates about some deep mathematics.

Anyway, if you have always wanted to give an answer to the layman's question: "But can you -prove- that 1+1 = 2?" then M381 is your course.