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Sigma KEE - LeapYear
LeapYear(闰年)

appearance as argument number 1
-------------------------


(documentation LeapYear ChineseLanguage "这是所有闰年的 Class。这些年份当中,要不是(i.)能被4 却不能被100整除的,或是 (ii.)能被400整除的(后者是为世纪闰年)。") chinese_format.kif 2791-2792
(documentation LeapYear EnglishLanguage "The Class of all leap years. These are years which are either (i.) evenly divisible by 4 and not by 100 or (ii.) evenly divisible by 400 (this latter case is known as a leap century).") Merge.kif 8907-8909
(externalImage LeapYear "http://upload.wikimedia.org/wikipedia/commons/8/ 89/ Gregoriancalendarleap.png") pictureList.kif 7182-7182
(subclass LeapYear Year) Merge.kif 8905-8905 闰年subclass

appearance as argument number 2
-------------------------


(termFormat ChineseLanguage LeapYear "闰年") chinese_format.kif 1275-1275
(termFormat EnglishLanguage LeapYear "leap year") english_format.kif 1767-1767

antecedent
-------------------------


(=>
    (and
        (instance ?LEAP LeapYear)
        (instance ?LEAP
            (YearFn ?NUMBER)))
    (or
        (and
            (equal
                (RemainderFn ?NUMBER 4) 0)
            (not
                (equal
                    (RemainderFn ?NUMBER 100) 0)))
        (equal
            (RemainderFn ?NUMBER 400) 0)))
Merge.kif 8911-8919
(=>
    (and
        (instance ?MONTH
            (MonthFn February ?YEAR))
        (instance ?Y ?YEAR)
        (instance ?Y LeapYear))
    (duration ?MONTH
        (MeasureFn 29 DayDuration)))
Merge.kif 8982-8987
(=>
    (and
        (instance ?MONTH
            (MonthFn February ?YEAR))
        (instance ?Y ?YEAR)
        (not
            (instance ?Y LeapYear)))
    (duration ?MONTH
        (MeasureFn 28 DayDuration)))
Merge.kif 8975-8980


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