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1. Based on the number set, a new commutative semi-group is established in the integer number and extended in number fields of rational number, real number and the complex number.
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2. Based on the number set, a new commutative semi-group is established in the integer number and extended in number fields of rational number, real number and the complex number.
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3. A cardinal number indicating the absence of any or all units under consideration.
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4. He indicated that the baidu user cardinal number and the difference are big.
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5. Huge user cardinal number and steady user growth are Tecent other business brings larger dominant position.
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