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Inductive Reasoning and Deductive Reasoning
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Types of Statements

CONDITIONAL STATEMENTS

Conditional or if-then statements are important in establishing logical arguments. The if-then form can be used to clarify vague statements.


Definition

Any statement in the form "If p, then q" is called an implication or a conditional statement. The statement p is called a hypothesis or premise, while the statement q is called its conclusion.

A conditional statement "If p, then q" can be expressed in many forms such as the following: "p implies q," "q if p," "q whenever p," or "q provided p."


Example

Express each statement in if-then form. Identify the hypothesis and the conclusion of each conditional statement.

1. Points on the same line are collinear.
2. Any two right angles are congruent.


Solution

In writing a statement in if-then form, you need to identify the hypothesis p and the conclusion q.

1. If points lie on the same line, then they are collinear.
Hypothesis: Points lie on the same line.
Conclusion: Points are collinear.
2. If A and B are right angles, then AB.
Hypothesis: A and B are right angles.
Conclusion: AB.