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The set of real numbers is closed under addition.
linked to #529042
linked to #878460

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Sentence #529040

The set of real numbers is closed under addition.

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Die Menge der reellen Zahlen ist abgeschlossen bezüglich der Addition.
実数[じっすう] の[] 集合[しゅうごう] は[] 加法[かほう] について[] 閉じ[とじ] て[] いる[] 。[]