Category:
Definition: Any argument of the form: If A then B, B, therefore A
Examples:
Proof:
Any argument of the following form is invalid:
If A happens then B will happen (First premiss)
B happened (Second premiss)
Therefore, A happened (Conclusion)
Show that even though the premises are true, the conclusion could be false. In general, show that B might be a consequence of something other than A. For example, the fish deaths might be caused by pesticide run-off, and not the mill. (Barker: 69, Cedarblom and Paulsen: 24, Copi and Cohen: 241)