Just image a line(x-axis), go through to the left with no end is −∞-\infty−∞ (negative infinity), go through to the right with no end is +∞+\infty+∞ (positive infinity), they both are ∞\infty∞ (infinity).
negative infinity
positive infinity
infinity
On the contrary, in the opposite of ∞\infty∞ is 000.
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