No x′ are m; No m′ are y. | ∴ No x′ are y. |
i.e. No one, but John, knows what the letter is about.
3. Those who are not old like walking;
You and I are young.
Univ. is “persons”; m = old; x = persons who like walking; y = you and I.
All m′ are x; All y are m′. | ∴ All y are x. |
i.e. You and I like walking.
4. Your course is always honest;
Your course is always the best policy.
Univ. is “courses”; m = your; x = honest; y = courses which are the best policy.
All m are x; All m are y. | ∴ Some x are y. |
i.e. Honesty is sometimes the best policy.