Modus Toll ens (Denying the consequent)

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# Modus Toll ens (Denying the consequent) - PowerPoint PPT Presentation

p. ————&gt;. q. Modus Toll ens (Denying the consequent). The modus tollens is one type of deductive inference . If Rex is a dog, Rex has four legs. Rex has not four legs. ---------------------------------------------- Rex is not a dog. p ————&gt; q (If p, then q) Not q (given: not q)

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## PowerPoint Slideshow about 'Modus Toll ens (Denying the consequent)' - ebony

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Presentation Transcript

p

————>

q

Modus Tollens (Denying the consequent)

The modus tollens is one type of deductive inference.

If Rex is a dog, Rex has four legs.

Rex has not four legs.

----------------------------------------------

Rex is not a dog

p ————> q (If p, then q)

Not q (given: not q)

-------------------------------------------

Not p (Inference: not p)

Not q

Not p

Please note that denying the antecedent is logically unsound: Even if Rex is not a dog, he can well have four legs.

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