Reasoning that derives specific conclusions logically from general principles or premises (deductive reasoning).
数学の証明では、一般の定理から個別の命題を演繹していくことが多い。
In mathematical proofs, it's common to deduce specific propositions from general theorems.
彼は観察結果から直接結論を出すのではなく、まず理論から演繹して検証した。
Rather than drawing conclusions directly from observations, he first deduced them from theory and then tested them.
演繹と帰納は対照的な推論の方法だ。
Deduction and induction are contrasting methods of reasoning.