Friday, 29 May 2015

number theory - Help finishing proof with polynomial discriminant?

Prove that the discriminant of f(x)=xn+nxn1+n(n1)xn2++n(n1)(3)(2)x+n! is (1)n(n1)/2(n!)n.



So far, I let α1,,αn be the roots of f(x). Taking the derivative of logf(x)=ni=1log(xαi), we have that f(x)f(x)=i=11xαi. Thus, f(αj)=ni=1,ij(αjαi) Then the discriminant is $$D = \prod_{i

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