Inference

On a test, you should be able to construct a validity proof for the argument shown below, if the argument is valid.
If the argument is invalid, find a counterexample.
Click the "get a clue" link to see a proof or counterexample.


Click "refresh" or "reload" to see another problem like this one.

Click here to get a clue



































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































SOLUTION



Return































Copyright (c) 2012, 2018, James Wooland, all rights reserved.