Gödel’s incompleteness, Turing’s halting undecidability, Kleene’s recursion theorem, Tarski’s truth undefinability, and Löb’s reflection theorem are five of the most celebrated results in 20th-century logic and computation. A new machine-checked theorem proves they are all instances of one master fixed-point framework.… Read More “One Theorem Behind Gödel, Turing, Kleene, Tarski, and Löb”