First thing I want to say is that I made a little mistake last time in lecture. It was gently pointed out to me. When I was talking about the heat equation; the floorshow was fine, the discussion was fine, but then I said this thing about as T tens to infinity, the temperature tens to zero. That wasn’t right. I forgot about the zero – because somebody said look, the fusion man, you don’t lose anything, it just diffuses. So it’s not right to say the temperature changes to zero, I was thinking of while it was escaping to the universe or something like that. ...

See the whole transcript at The Fourier Transform and its Applications Co - Lecture 06