Logic: the principles of reasoning and the coherence of thought; the study of valid inference.
論理に基づいた説明をすることが大切だ。
It's important to give explanations based on logic.
この問題は論理的に解くことができる。
This problem can be solved logically.
論理学の基礎を大学で学んだ。
I studied the basics of logic at university.