(1) If A is B, C is D
If A is B, E is F
∴ If C is D, E is F
(2) If A is B, C is D
If C is D, E is F
∴ If A is B, E is F
(3) Show by circles that two of the possible four hypothetical arguments are invalid.
(4) What categorical rules does the hypothetical argument seem to violate? Explain.
(5) Originate a hypothetical syllogism whose antecedent and consequent are both negative. Test its validity.
(6) Originate a co-extensive hypothetical argument and show that four valid syllogisms may be derived from it.