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the claim
Modus tollens is a logically valid rule of inference.
the verdict
SUPPORTED
the evidence backs this
refutedsupported
the weight of evidence
4 sources for · 0 against
AS REPORTEDno primary record reached; this is what the reporting says

Standard reference sources in formal logic establish that modus tollens is indeed a valid rule of inference.

Evidence for · 4
Wikipedia: Modus tollens
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Judged against reference works: claims of this kind are settled by reference works, not journal abstracts.

More for · 3
Wikipedia: Rule of inference
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Reference article covering this claim directly
Wikipedia: Modus ponens
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Reference article covering this claim directly
Wikidata: modus tollens — instance of
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It lists modus tollens as an instance of a rule of inference.
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first checked04 Aug 2026
judged → SUPPORTED · 7504 Aug 2026
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