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When is an argument invalid?

Question asked by: bellaleo

Asked on: 22 Apr 2010

An argument is invalid when the logical form of the argument is not valid, i.e. the conclusion does not follow from the premises.

For instance if I say:

Whenever it rains I use an umbrella
I am using an umbrella
Therefore it is raining

this is INVALID, because the conclusion does not follow from the premises.

By: knowitall
Replied at: 25 Apr 2010
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