eolas/neuron/c4748128-760b-453d-8fad-c87631f317ca/Negation_Introduction.md

tags
logic propositional-logic

Negation Introduction

This is also known as proof by contradiction. You start with an assumption declared in a sub-proof. If you can derive a contradiction from this assumption (typically from the introduction of another proposition and its negation), then you are permitted to derive the negation of the auxiliary assumption in the main proof.