Deductive reasoning

Definition

Deductive reasoning uses rules, definitions, or necessary relationships to reach a conclusion. If the premises are true and the argument is valid, the conclusion must be true — there is no maybe about it.

Memory hook

“Deduction = rule-based certainty.”

What it sounds like

• All … are …, and this is one, so…
• By definition…
• If that's true, then this must be true.