How does one prove the Church-Turing-Deutsch Principle? The principle states that a universal computing device can simulate every physical process. Not sure where to post this, as it seems like a pertinent question in proving the simulated universe thesis right or wrong along with possible justification in support of Everettian QM. I also don't know how to reconcile the Church-Turing-Deutsch Principle with Gödel's incompleteness theorems. Any input greatly appreciated alleviating my confusion.