Quote Originally Posted by lizbud View Post
Soundness and Validity are both properties of deductive arguments. For an argument to be Valid the conclusion must follow from the premises; that is, if the premises are true your conclusion MUST be true. For example, If all dogs are animals, and all poodles are dogs; all poodles must be animals, is a valid argument. Whereas, If all dogs are animals; all animals must be dogs is invalid. This is because the conclusion is not directly derived from the premises.

For an argument to be Sound there are two criteria: the argument must be Valid, and the premises must be True. For example, all dogs are animals, poodles are dogs; therefore, poodles must be animals, is Valid and True and therefore Sound. Whereas, All dogs are cats, all poodles are dogs; therefore poodles must be cats, is certainly Valid, it is not Sound because the premises are not true.
Liz,

Can you repost this before I eat dinner?

I get slow and stupid after I eat?

And don't let Pam see this!

She thinks poodles are human!