Zero is not opposite infinity. If all opposites sum to zero than zero+infinity do not. Zero can be difined as (x-x), or two exact opposites. When dividing zero one arrives at 0/x=0 but through algebra 0(0) must = x. When zero is in a finite system (x-x)+x=x One finds that zero retains its self nullifying properties. Yet in divisions and multiplications zero takes on properties other than its own. Groups of zero, or only zero produce something, but when there is something zero keeps self nullification.
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But it IS its own ADDITIVE opposite.
Zero is the middle. The neutral. There has to be something to separate the positive and the negative.
Zero is the only number that's its own opposite. While 0 is technically not signed (it's neither positive nor negative), it meets the definition for being its own opposite because 0 + 0 = 0.
The opposite of zero - in the sense of additive inverse - is zero.
Apart from zero (which is its own opposite), the opposites of whole numbers are also whole numbers. You have the set of whole numbers which is also known as the set of integers.