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[[ Knowledge base ]]

[( Abstract relations )]

[- Things and features -]

({ Being the same Being a feature No features })
({ Specified features Amalgamation Union })
({ Division Cross union Link })
({ Partial difference Intersection Being a part })
({ Proper part Being flush Link relations })
({ Domain Range Cartesian product })
({ Part relation Assumed features An impossible thing })
({ Example of a Meaning A thing not a feature Projection })
({ Indexed relations Disjoint Relation conversion })
({ Relations from Sentences })

[- Number -]

({ Ordinal numbers Natural numbers Whole numbers })
({ Rational numbers Complex numbers })

(_ ThingsAndFeatures _)

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