ReverseFn - Sigma Knowledge base Browser

appearance as argument number 1

(documentation ReverseFn EnglishLanguage "The reverse of a string.")	Media.kif 3052-3052
(domain ReverseFn 1 SymbolicString)	Media.kif 3050-3050	The number 1 argument of the reverse of is an instance of symbolic string
(instance ReverseFn UnaryFunction)	Media.kif 3049-3049	The reverse of is an instance of unary function
(range ReverseFn SymbolicString)	Media.kif 3051-3051	The range of the reverse of is an instance of symbolic string

appearance as argument number 2

(format EnglishLanguage ReverseFn "the reverse of %1")	Media.kif 3054-3054
(termFormat EnglishLanguage ReverseFn "the reverse of")	Media.kif 3053-3053

antecedent

(=>
    (and
        (equal ?OUT
            (ReverseFn ?IN))
        (equal ?LEN
            (StringLengthFn ?IN))
        (greaterThan ?LEN 1)
        (greaterThan ?N 0)
        (lessThan ?N ?LEN)
        (equal ?PIVOT
            (CeilingFn
                (DivisionFn
                    (SubtractionFn ?LEN 1) 2)))
        (equal ?NEW
            (AdditionFn
                (SubtractionFn ?PIVOT ?N) ?PIVOT))
        (equal ?S
            (SubstringFn ?IN ?N
                (AdditionFn 1 ?N))))
    (equal ?S
        (SubstringFn ?OUT ?NEW
            (AdditionFn 1 ?NEW))))

Media.kif 3056-3077

If a symbolic string is equal to the reverse of another symbolic string and a nonnegative integer is equal to the length of the other symbolic string and the nonnegative integer is greater than 1 and another nonnegative integer is greater than 0 and the other nonnegative integer is less than the nonnegative integer and an integer is equal to the ceiling of (the nonnegative integer and 1) and 2 and the other nonnegative integerEW is equal to ((the integer and the other nonnegative integer) and the integer) and a third symbolic string is equal to the sub-string of the other symbolic string from the other nonnegative integer to (1 and the other nonnegative integer),
then the third symbolic string is equal to the sub-string of the symbolic string from the other nonnegative integerEW to (1 and the other nonnegative integerEW)

consequent

(=>
    (and
        (instance ?WORD Palindrome)
        (spellingInLanguage ?LANGUAGE ?WORD ?SYMBOLICSTRING))
    (equal ?SYMBOLICSTRING
        (ReverseFn ?SYMBOLICSTRING)))

Media.kif 3084-3089

If a word is an instance of Palindrome and the word in Language a language is spelt as a symbolic string.,
then the language is equal to the reverse of the language

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