No True Scotsman

Type: Informal — Definition Also Known As: Appeal to purity, definitional retreat

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Definition

Redefining a term to exclude counterexamples after they are presented.

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Form

[Standard logical form to be added]

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Examples

Example 1

No Scotsman puts sugar on his porridge. But my uncle does. Then he’s no true Scotsman.

Example 2

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Example 3

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Example 4

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Why It Persuades

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How to Counter

[To be added]

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Related Concepts

• Related Fallacy
• Related Bias

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References

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Part of the Convergence Protocol — Clear thinking for complex times.