A question on hypothetical syllogism?

What is an example of hypothetical syllogism?

In classical logic, a hypothetical syllogism is a valid argument form, a syllogism with a conditional statement for one or both of its premises. An example in English: If I do not wake up, then I cannot go to work. If I cannot go to work, then I will not get paid.

What are the 3 types of hypothetical syllogism?

The Hypothetical Syllogism Hypothetical Syllogism is a syllogism that has a hypothetical proposition as one of its premise Kinds of Hypothetical Syllogism: 1. Conditional Syllogism (“If…, then…”) 2. Disjunctive Syllogism (“Either…, or…”) 3. Conjunctive Syllogism (“Not both…, and…”)

How do you solve a hypothetical syllogism?


The key point is that with conditionals the only valid inference is from antecedent to consequent you can't go the other way. So just to summarize this is a no-no.

What makes a hypothetical syllogism valid?

A valid hypothetical syllogism either denies the consequent (modus tollens- m.t.d.c.) or affirms the antecedent (modus ponens-m.p.a.a.) of the major premise; it does not deny the antecedent or affirm the consequent.

How many types of hypothetical syllogism are there?

There are thus four possible forms of such syllogisms, two of which are valid, while two of which are invalid.

What is pure hypothetical syllogism?

Pure hypothetical syllogisms—arguments of the form ‘ If p, then q : if q, then r : therefore, if p, then r‘—have been traditionally regarded as clearly valid. 1 Such arguments are, indeed, valid, if the constituent state- ments are taken to express mere material implications.

Is hypothetical syllogism a tautology?

Hypothetical syllogism If both implications are true, then the resulting implication is true. Disjunctive syllogism If a disjunction is true, and one proposition is not true, then the other proposition must be true. The table below shows that it is a tautology.

What is hypothetical syllogism critical thinking?

A hypothetical syllogism is one wherein the major premise is a hypothetical proposition, and the minor premise and conclusion are categorical propositions. I. CONDITIONAL SYLLOGISM. — It is one whose major premise is a conditional proposition and whose minor premise and conclusion are categorical propositions.

What is the basis of the rule of inference called hypothetical syllogism?

A hypothetical proposition, for Theophrastus is a proposition made up of two or more component propositions (e.g., “p or q,” or “if p then q”), and a hypothetical syllogism is an inference containing at least one hypothetical proposition as a premise.

Is it possible to commit the fallacy of affirming the consequent in a pure hypothetical syllogism?

Is it possible for a single syllogism both to commit the fallacy of affirming the consequent and the fallacy of denying the antecedent? No, unless the second premise and the conclusion each assert two different propositions.

What is hypothetical proposition?

A hypothetical proposition, for Theophrastus is a proposition made up of two or more component propositions (e.g., “p or q,” or “if p then q”), and a hypothetical syllogism is an inference containing at least one hypothetical proposition as a premise.

Is modus ponens a syllogism?

The form of a modus ponens argument resembles a syllogism, with two premises and a conclusion: If P, then Q. P. Therefore, Q.

What is conditional syllogism?

Conditional syllogisms follow an, “If A is true, then B is true” pattern of logic. They’re often referred to as hypothetical syllogisms because the arguments aren’t always valid. Sometimes they’re merely an accepted truth like these examples. If Katie is smart, then she will get into a good college.

Is disjunctive syllogism valid?

In classical logic, disjunctive syllogism (historically known as modus tollendo ponens (MTP), Latin for “mode that affirms by denying”) is a valid argument form which is a syllogism having a disjunctive statement for one of its premises.

What is syllogism law?

In mathematical logic, the Law of Syllogism says that if the following two statements are true: (1) If p , then q . (2) If q , then r . Then we can derive a third true statement: (3) If p , then r .

Who created syllogism?

Aristotle

Developed in its original form by Aristotle in his Prior Analytics (Analytica priora) about 350 bce, syllogistic represents the earliest branch of formal logic. A brief treatment of syllogistic follows. For full treatment, see history of logic: Aristotle.

Why syllogism is important?

More specifically, writers might choose to use syllogism because: Using a syllogism can help make a logical argument sound indisputable, whether it’s being used to illustrate a simple point or a complex one.

Why is syllogism important in mathematics?

It can be used with more than three events and is important for making logical arguments make sense in any branch of mathematics.

How is syllogism related to law?

Law of Syllogism Definition



Syllogism refers to drawing inferences from given prepositions or sentences. The Law of Syllogism is actually a part of deductive reasoning where we arrive at conclusions by logical reasoning. It is similar to the transitive property: if a = b and b= c, then a=c. It is like a chain rule.

What is the pattern of a syllogism?

A syllogism is a method of reasoning by drawing a conclusion from two premises. The particular pattern of a syllogism is that the first, major premise shares something with a second, minor premise, which in turn leads to a conclusion, like this: I am creeped out, but also fascinated, by all spiders.