Arturo O. answered • 09/03/17

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Negation: There exists at least one cow that does not eat grass.

I want to point out a common mistake. Someone might answer "All cows do not eat grass." But that is not the negation of the original proposition that "all cows eat grass." The way to negate a universal claim about the objects in a set is to state there exists at least one object in the set that does not satisfy the universal claim.