The guiding principle of reductio ad absurdum is that
A) whatever implies a contradiction is false.
B) systems of natural deduction often lead to absurd conclusions.
C) it is not always possible to reduce a set of statements to absurdity.
D) often the most straightforward method for deriving a contradiction is by assuming an absurdity.

Question

Quizplus · Accepted Answer

Reductio ad absurdum is a logical principle where a statement is proven false by showing that it leads to a contradiction, thus whatever implies a contradiction is false.

The Guiding Principle of Reductio Ad Absurdum Is That