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Positive

Usage

• 如果 x是一个正整数， Positive[x]给出True。


Notes

• 如果 x明显是一个负数值，一个复数量或零，Positive[x]给出False。否则，它不进行计算。
• 同时参见: Negative, NonNegative, Sign, Greater, Simplify, Assumptions.
Further Examples

Positive is unsure about -x so doesn't evaluate it further.

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