eolas/neuron/ac28ab9c-a447-4a90-96b7-2f2694d2a9e4/Negation_Elimination.md

tags
logic propositional-logic

Negation Elimination

Like the introduction rule for negation, the elimination rule also works by deriving a contradiction. It is basically Negation Introduction in reverse. Instead of starting the sub-proof with a true proposition from which you derive a contradiction, you start with the negation of a proposition, derive a contradiction and then assert the positive of the negated proposition you started out with.