h.and

强大的数学工具包

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        "and"

        "&&" is an operator which operates on two elements of Z, Q, R,
        C, elements of Z/mZ, algebraic numbers or Galois-field 
        elements: "el1 && el2".
        If el1 = 0 or el2 = 0 , "&&" returns 0, else "&&" returns 1.


        Example 1: (correct)

                log2(123/45) && gcd(24, 76)


        Example 2: (correct)

                MOD(5) && NF(A)


        Example 3: (incorrect)

                5 + x && x^2 + 1/y

_ERR_NR_283