Modal logic, an extension of classical logic, investigates the modes of truth such as necessity and possibility. Its development has been closely intertwined with advances in proof theory, a field ...

What seem to be Kurt Gödel's first notes on logic, an exercise notebook of 84 pages, contains formal proofs in higher-order arithmetic and set theory. The choice of these topics is clearly suggested ...

Ever stared at a math problem feeling completely lost, even when you've memorised all the formulas? Or maybe you've wondered why certain math rules even exist? The true secret weapon that unlocks ...