Logic
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Deductive Argument
An argument in which the premises are claimed to support the conclusion in such a way that it is IMPOSSIBLE for the premises to be true and the conclusion false.

Inductive Argument
An argument in which the premises are claimed to support the conclusion in such a way that it is IMPROBABLE that the premises are true and the conclusion false.

Valid Argument
An argument such that it is impossible for the premises to be true and the conclusion false.

Invalid Argument
A deductive argument such that it is possible for the premises to be true and the conclusion false.

Sound Argument
A deductive argument that is VALID and has ALL TRUE PREMISES.

Strong Inductive Argument
An inductive argument such that it is IMPROBABLE that the premises be true and the conclusion false.

Weak Inductive Argument
An inductive argument such that the conclusion does not follow probably from the premises, even though it is claimed.

Cogent Argument
An inductive argument that is STRONG and has ALL TRUE PREMISES; if either condition is missing, the argument is uncogent.

Sound Argument
A deductive argument that is VALID and has ALL TRUE PREMISES.