(subclass NonnegativeInteger Integer) | Merge.kif 1986-1986 | Nonnegative integer is a subclass of integer |
(subclass NonnegativeInteger NonnegativeRealNumber) | Merge.kif 1987-1987 | Nonnegative integer is a subclass of nonnegative real number |
(subclass PositiveInteger NonnegativeInteger) | Merge.kif 2005-2005 | Positive integer is a subclass of nonnegative integer |
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