Thanks. Approximator, not calculator, though. Can make a difference (which can also lead to different mathematical and physical capabilities). But comes back to

Thanks. Approximator, not calculator, though. Can make a difference (which can also lead to different mathematical and physical capabilities). But comes back to my point: because hypothetically one system might be able to approximate another system doesn't mean that it will happen practically that one system is equivalent to the other. Whether or not depends on the properties of the system to be approximated (leaving aside that not everything is a mathematical function).