I know that the above is an example of mediate inference because the two antecedent judgments make use of the middle term, “good citizen.”
(2b) Why is the following illustrative of mediate inference?
“All wise men are close observers,”
“All wise men are thoughtful,”
Hence, “Some thoughtful men are close observers.”
(3a) Derive immediate inferences by opposition from the following:
(1) “Good men are wise.”
(2) “No teacher can afford to be unjust.”
(3) “All birds fly.”
(4) “None of the inner planets are as large as the earth.”