Some of the discussion on the “Edward Feser and Vincent Torley” thread seems to have drifted way off topic. So I’m starting a new thread for further discussion on realism.
I’ll just quote part of a recent comment by BruceS:
1. A complete description of the world is a scientific description (or has a large component that is a scientific description).
2. Science is in principle reducible to physics.
3. Physics requires mathematics.
4. Mathematics is “unreasonably effective” when used in physics, which is saying that somehow the world is describable by mathematical concepts.
5. The (parts of the) any two separate complete description of the world (eg by us and some alien species) in mathematical physics will hence involve the same (or at least mathematically equivalent) concepts.
I realize all of these statements are quite questionable, although I would have thought that #3, the need for mathematics in physics, would have been among the least questionable premises!
My own contribution to the thread will be in the comments.
For reference — HERE is a link to an earlier comment by walto that started the discussion of realism