The Church Cheering Douch Principle

The laws of physics constrain what computation is. And all mental activities, including all intuitions and all methods of proof are physical ocas ay. David writes near the end of this chapter, beauty right and wrong, primality, infinite sets, they all exist objectively, but not physically. What does that mean? Certainly they can affect you, as examples like hofsteres show,. But apparently not in the same sense that physical objects do. You cannot trip over one of them in the street.