Covered by EXCLAMATION-MARK•HYPHEN-MINUS.md
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## !-
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"not negative"
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(Function, Boolean Predicate)
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Integer on top of stack is replaced by Boolean value indicating whether
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it is non-negative.
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N !-
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----------- N < 0
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false
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N !-
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---------- N >= 0
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true
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### Definition
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0 >=
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