最終更新日：2025/11/20
The professor explained that an ordered pair (a, b) represents two elements in a fixed order, so (a, b) and (b, a) are different when a ≠ b.
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The professor explained that an ordered pair (a, b) represents two elements in a fixed order, so (a, b) and (b, a) are different when a ≠ b.
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