So for rule #2 "Must have S condition in common" this means that it just has to be a sufficient condition in one of the S&N conditions? It does not have to be the sufficient in both conditions, correct?
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I assume you are discussing Rule 2 at approximately minute 29 of the lecture.
One of the premises in each of these examples is a “some†statement. The other premise is the sufficient/necessary statement. The sufficient condition must be in common in both premises. For example, in Example 4, Z is what is in common of both premises, but Z is the necessary condition in the sufficient/necessary statement — and so there is no valid inference.
