<p>If a definition is to be understood as introducing the definitum, so that it means “Let so and so — the definitum — mean so and so — the definition”, then it is a proposition in the imperative mood, and consequently, not a proposition; for a proposition is equivalent to a sentence in the indicative mood.</p> | <p>If a definition is to be understood as introducing the definitum, so that it means “Let so and so — the definitum — mean so and so — the definition”, then it is a proposition in the imperative mood, and consequently, not a proposition; for a proposition is equivalent to a sentence in the indicative mood.</p> |