To explain:
The negative rational set is a field or not.
Answer to Problem 37WE
The negative rational number set is not a field.
Explanation of Solution
Definition of identity property of the addition:
The identity property of the addition is that if the number
Thus, from the property of identity that for any real number
The number
Therefore, negative rational number set is not a field.
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Algebra and Trigonometry: Structure and Method, Book 2
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