?? h.disc
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* * * * * * * * disc * * * * * * * * "discriminant" SYNTAX: X = disc(P, x, alg) P is an expression whose value is a polynomial over Z or Z/pZ (where p is a prime). x is a variable of P. alg is 1, 2, 3 or 4. X is assigned the discriminant of P with respect to the variable x. X is computed according to the following algorithms: If P is a polynomial over Z: the algorithm of Hankel, if alg = 1, the algorithm of Sylvester, if alg = 2, the algorithm of Collins-Sylvester, if alg = 3, the algorithm of Collins, if alg = 4. If P is a polynomial over Z/pZ: the algorithm of Hankel, if alg = 1, the algorithm of Sylvester, if alg = 2, the algorithm of Collins, if alg = 3 or 4. Warning: If p > 2^30, the primality of p is not tested. Example 1: (correct) disc(a*x^2 + b*x + c, x, 1) Example 2: (incorrect) disc(x*y + x^2 + 1/7 , x, 2)_ERR_NR_041?? 快捷鍵說明
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