A: All men are human. This proposition reference is using the entirety of the class men and the partial class of humans. By using the phrase men, it satisfies the universal quantity by stating “all men”. The partial affirmative quantity is also satisfied because human is made up of men and women, making this a true statement. E: No men are birds. In this proposition reference, the universal quantity is still men, but it is now stating that the class of men is not a part of the negative quality, which is “birds”. This categorical proposition becomes true because all qualifications are met and satisfied. I: Some men are bald. The proposition here is constructed of the partial class of men, as well as the partial class of bald. This means that only a portion of the class of men, which is a particular quantity, is a part of the partial class of bald people, which is the affirmative quality. Thus, it does not show that all men are a part of the population that is bald, nor does it show that all men are a part of the population that is not bald. This statement then becomes true because there are people of the population that are not bald, and there are bald women. O: Some men are not bald. This proposition is essentially the opposite of the previous proposition. It is made up of the partial class of men (particular quantity) and also the partial
4 class of people who are not bald (negative quality). In the O, it is conveying that a share of men is not members of the population of people who are not bald. The categorical proposition is true because there are men who are not bald and there are also women who are not bald.
You've reached the end of your free preview.
Want to read all 5 pages?
- Fall '17
- Burt Stiller
- Logic, Syllogism, Categorical proposition, Traditional logic