Class Notes (1,100,000)

CA (620,000)

Ryerson (30,000)

SSH (300)

SSH 105 (200)

Andrew Hunter (30)

Lecture 3

School

Ryerson UniversityDepartment

Social Sciences and HumanitiesCourse Code

SSH 105Professor

Andrew HunterLecture

3This

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Condional statement is a statement of the form:

If P... then Q

Condionals are compound statements composed of two parts:

Antecedent – what follows the word “if”

Consequent – what follows the word “then”

Necessary Condions:

A is necessary for B. Without A, B would not be true

Sucient Condions:

A is a sucient condion for B. If A is true, then B is true

Ex. If John is a bachelor, then John is unmarried.

"then John is unmarried" - is a Consequent, necessary condion

"John is a bachelor" - is a Antecedent, sucient condion

Therefore:

Condional Statement

1. Antecedent expresses a sucient condion

2. Consequent expresses a necessary condion

Valid Condional Arguments:

1. Arming the Antecedent

If P, then Q

P

Therefore, Q

Must be Valid. (true premises = true conclusion)

Ex. (1) If a shape is a square, then it has four sides

(2) The shape is a square

Therefore,

(3) It has four sides

2. Denying the Consequent

If P, then Q

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