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In logic, counterinduction is the rule[clarification needed Tool? Inductive fallacy? Idea? Hypothesis to show invalidity?] of inference that one should assume the opposite of what induction suggests. For example:

"The Sun has risen every day in the past, therefore I think that it will not rise tomorrow."

Most of the time when counterinduction is mentioned, it is not presented as a valid rule. Instead, it is given as a refutation of Max Black's proposed inductive justification of induction, since the counterinductive justification of counterinduction[jargon] is formally identical to the inductive justification of induction.[1] For further information, see Problem of induction.

Paul Feyerabend's anarchist theory popularized the notion of counterinduction.

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