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addition
One of the basic operations of algebra and addition, denoted by the sign "+". The addition of positive numbers can best be defined in terms of set theory; if one considers set A to contain 4 elements, set B to contain 5 elements, then A U B (see union) contains 9 elements; i.e., 4 + 5 = 9. The addition of negative numbers is equivalent to subtraction in that a + (-b) is equivalent to a - b.
Related categories
• ALGEBRA
• ARITHMETIC
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