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Definition | Representation | |
---|---|---|
Positive Numbers | A real number $x$ is said to be positive if it is greater than $0.$ | $0<x<∞$ or $x>0$ |
Negative Numbers | A real number $x$ is said to be negative if it is less than $0.$ | $-∞<x<0$ or $x<0$ |
Non-Positive Numbers | A real number $x$ is said to be non-positive if it is less than or equal to $0.$ | $-∞<x≤0$ or $x≤0$ |
Non-Negative Numbers | A real number $x$ is said to be non-negative if it is greater than or equal to $0.$ | $0≤x<∞$ or $x≥0$ |