Please note that talks are not publications - i.e. please don't take literally what is written in the slides. These came with an "audio" adding remarks, etc, which can't be appreciated from the
On the concepts of universality in physics and computer science, Algorithmic Information, Induction and Observers in Physics, Perimeter Institute, Waterloo, Canada, April 9 to 13, 2018.
(Available at pirsa).