Tangled is that which measurably interacts with something else for any practical purposes at the current level of analysis. If there's a function A that does no

Tangled is that which measurably interacts with something else for any practical purposes at the current level of analysis. If there's a function A that does not call function B (and vice versa), they are not tangled. They are separate (assuming the functions are pure, no global shared state, etc). Now we can go down the physics rabbit hole and start arguing that everything is tangled at some level but I don't think that's useful for a discussion at this level of analysis. I think we can stick to the definition that if function A does not call function B, they are completely separate for the purpose of this discussion.