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Image talk:Propositional logic.png - Wikipedia, the free encyclopedia

Image talk:Propositional logic.png

From Wikipedia, the free encyclopedia

[edit] Material Equivalence

There is an error on material equivalence, both conditions are necessary to make p equivalent to q:

image: (p is equiv. to q) means, either (if p is true then q is true) or (if q is true then p is true)
- $(p \equiv q) \equiv [(p \rightarrow q) \or (q \rightarrow p)]$
correct: (p is equiv. to q) means, (if p is true then q is true) and (if q is true then p is true)
- $(p \equiv q) \equiv [(p \rightarrow q) \and (q \rightarrow p)]$

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