But it IS its own ADDITIVE opposite.
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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.
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.
Daytime and noon are examples.
Positive plus positive equals positive. Negative plus negative equals negative. Positive greater than negative equals positive. Negative greater than positive equals negative.