Logical System gentzen Reductio ad Absurdum 2/24/06 Absurd Introduction and Simple Reductio Your browser does not support html5 video. Advanced Reductio via Double Negation Your browser does not support html5 video. Book traversal links for Help with Reductio ad Absurdum ‹ Tutorial 8: Reductio ad Absurdum Up Further help with Reductio ›