Sigma KB Term Intersection

(=>
    (and
        (birthdate ?A ?DAY)
        (instance ?DAY
            (DayFn ?D
                (MonthFn ?M
                    (YearFn ?Y)))))
    (exists (?CLASS ?FUTURE)
        (and
            (birthday ?A ?CLASS)
            (subclass ?CLASS Day)
            (instance ?FUTURE Integer)
            (equal ?CLASS
                (DayFn ?D
                    (MonthFn ?M
                        (YearFn ?FUTURE))))
            (greaterThan ?FUTURE ?Y))))

Mid-level-ontology.kif 25885-25895

If a day is a birthdate of a human and the day is an instance of the day a positive integer of month the month a kind of month,
then there exist another kind of day and an integer such that the human's birthday is another kind of day and the other kind of day is a subclass of day and the integer is an instance of integer and the other kind of day is equal to the day the positive integer of month the month a kind of month and the integer is greater than another integer

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