Tutorial-Classical Deductive Logic

Classical Deductive Logic

A categorical syllogism is a deductive argument with two premises, in which the premises and the conclusion are categorical propositions.
A categorical proposition, in turn, is a statement that makes a straightforward assertion with no "ifs," "ands," or "buts." Categorical propositions are typically expressed by simply structured sentences containing a subject and a predicate, but not conjunctions or the other grammatical devices involved in more complex sentences.

Comprehension Questions

1. Is the following a categorical proposition?
A dog is a mammal, if it has hair.

a) yes

b) no

2. Is the following a categorical proposition?
Either that is a dog, or it is a funny looking cat.

a) yes

b) no

3. Is the following a categorical proposition?
Amphibians breathe from their mouth, except when they are under water.

a) yes

b) no

4. Is the following a categorical proposition?
Those who have the courage to dare will succeed.

a) yes

b) no

Components of Categorical Propositions

1.	Is the following a categorical proposition? A dog is a mammal, if it has hair.

	a)	yes
	b)	no


2.	Is the following a categorical proposition? Either that is a dog, or it is a funny looking cat.

	a)	yes
	b)	no


3.	Is the following a categorical proposition? Amphibians breathe from their mouth, except when they are under water.

	a)	yes
	b)	no


4.	Is the following a categorical proposition? Those who have the courage to dare will succeed.

	a)	yes
	b)	no