4.1: Definition and Properties - Mathematics LibreTexts
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WEBAug 24, 2021 · by substituting n (A) for 0 and n (B) for 4. = n (\ (A \cup B\)) by the set theory definition of addition. = n ( {a, b, c, d}) by computing \ (A \cup B\) = 4. by counting the elements in \ (A \cup B\) Therefore, 0 + 4 = 4. The definition of addition allows us to verify some properties about addition.
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