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Answers for “为什么在这个范畴中,存在从 3 到 4 的态射,但不存在从 4 到 3 的态射?”

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The category R\mathbb{R} is defined as a poset category where the objects are real numbers, and there is a morphism x→yx \to y exactly when x≤yx \le y. This means the morphisms encode the ordinary order relation on the real numbers.

Conditions: Objects are real numbers.; A morphism x→yx\to y exists precisely when x≤yx\le y.