A handbook of logic by Joseph Gerard Brennan

By Joseph Gerard Brennan

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Some Bedlington terriers look like rats . All that look like rats look like lambs. We can see that this syllogism also violates the rule which says that no term may be distributed in the conclusion which was not already distributed in its proper premise. In other words, an illicit minor is committed here as well as a violation of the present rule. 9. From two affirmative premises, a negative conclusion cannot be drawn. An example of a violation of this rule ollows: All teddy-bears are bad-mannered.

Traditional nomenclature assigns the label "simple conversion" to conversions of the E and I type. " OBVERSION To obtain the obverse of a proposition, two things must be done: (I) Change the quality of the original proposition (the obvertend); that is, if the original proposition is negative, change it to affirmative, or vice versa. (2 ) Negate the predicate term of the obvertend by attaching the prefix "non-" to it. To negate "organic," make it "nonorganic" or "inorganic"; to negate "polite" change it to "non polite" or "impolite," etc.

3. The wendigo is not a fish. 4. Every California school teacher drives a late model car. 5. Many Chinese poets drink wine. 6. Some theodolites have a mechanical shutter arrangement. 7. None who hold public office are eligible for jury duty. 8. Happy are those cats who die for catkind. 9. Tiger snakes are poor bedfellows. 10. Sound-detecting homing systems are useful 10 underwater warfare. 2. Give, where possible, the converse, obverse, partial and full contraposition, and obverted converse of each of the following propositions.

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