Cognitive Scaffold

Preparing your thinking workspace

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MENTAL MODEL · M3790

Reductio ad Absurdum

Reductio ad Absurdum
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Version 1.0.0 · Updated 2026-07-30

CORE DEFINITION

To refute a viewpoint, first assume it is true, then through rigorous logical deduction, arrive at an absurd or self-contradictory conclusion, thereby proving the original assumption false. Scaffolding role: extreme extrapolation. Test whether a strategy is feasible by pushing it to its limits. What if the whole company did this? What if it were done forever? If it collapses at the extreme, the logic has a flaw.

SCAFFOLDING EFFECT

psychology

Reduce cognitive load

Extreme extrapolation. Test whether a strategy is feasible by pushing it to its limits. What if the whole company did this? What if it were done forever? If it collapses at the extreme, the logic has a flaw.

anchor

Anchor fast decisions

Reductio ad absurdum first assumes the opponent's proposition is true, then follows its logic to derive an obviously absurd consequence or one that contradicts known facts, thereby disproving the original proposition. Its power comes from the deductive structure 'if the premise is true, the conclusion must be true,' allowing errors to expose themselves through extreme extrapolation.

MINIMUM ACTION

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Source support: Explicit

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    en.wikipedia.orghttps://en.wikipedia.org/wiki/Reductio_ad_absurdumZH · Explicit
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