(subclass NonnegativeRealNumber RealNumber) | Merge.kif 1932-1932 | Nonnegative real number is a subclass of real number |
(subclass PositiveRealNumber NonnegativeRealNumber) | Merge.kif 1943-1943 | Positive real number is a subclass of nonnegative real number |
(subclass NonnegativeInteger NonnegativeRealNumber) | Merge.kif 1987-1987 | Nonnegative integer is a subclass of nonnegative real number |
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