] gives True if x is a positive number.
] gives False if x is manifestly a negative numerical quantity, a complex numerical quantity, or zero. Otherwise, it remains unevaluated.
A definition like Positive[
True effectively specifies that x is a positive number.
Definitions for Sign are tested in determining whether linear combinations of expressions are positive.
See also: Negative, NonNegative, Sign.
Positive is unsure about -x so doesn't evaluate it further.
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