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Term 1: Term 2:

(subclass NonnegativeRealNumber RealNumber) Merge.kif 1921-1921 非负实数 是 实数 的 subclass
(subclass PositiveRealNumber NonnegativeRealNumber) Merge.kif 1932-1932 正实数 是 非负实数 的 subclass
(subclass NonnegativeInteger NonnegativeRealNumber) Merge.kif 1976-1976 非负整数 是 非负实数 的 subclass


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