3 ms·Proofs and Refutations is a great book https://a.co/d/0cXTgHgv https://a.co/d/0cXTgHgvby jjtheblunt 4mo agoProofs and Refutations is a great book https://a.co/d/0cXTgHgv https://a.co/d/0cXTgHgv