h.denom

强大的数学工具包

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                               *   denom   *
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        "denominator"
        SYNTAX: X = denom(A)

        A is an expression whose value is an integer or a rational 
        number, a polynomial over Z or Q, a rational function or a 
        matrix or a vector over these structures.

        If A is a rational number or a rational function, X is assigned
        the denominator of A.
        If A is a polynomial over Q, X is assigned the least common
        denominator of all polynomial coefficients.
        If A is a matrix or a vector, X is assigned the least common
        denominator of all entries.
        If A is an element of Z, a polynomial over Z, a matrix or a
        vector over these structures, then X is assigned 1.


        Example 1: (correct)

                denom(x^4 + 7 * x^2 + 2)


        Example 2: (correct)

                denom((x^3 + 6*x^2 + x + 9)/(y + 1))


        Example 3: (correct)

                denom({{x/y, 1/7, 3} {0, 2, 2/21} {1/(y*z), x + y, 3}})


        Example 4: (incorrect)

                denom(MOD( 3123123 ))

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