The rational numbers form an algebraic structure with respect to addition and this structure is called a group. And it is the property of a group that every element in it has an additive inverse.
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The additive inverse of EVERY positive rational number is a negative number.
It is a fundamental requirement of algebraic structures called groups.
For every number, a,there exists a number called the additive inverse, -a, such that a + -a = 0.
Yes. Just put a minus sign in front of it. Note that except for the zero, the additive inverse is no longer a natural number.
Yes.