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The following code produces an error the following n=4 k=n*(n-1)/2 L=PolynomialRing(ZZ,k,"x")

if second arguments is a string with no commas, then there must be no other non-optional arguments... If I replace k by 6 everything works, I cannot understand why. Thanks for any help

The following code produces an error the following n=4 k=n*(n-1)/2 L=PolynomialRing(ZZ,k,"x")code

n=4
k=n*(n-1)/2
L=PolynomialRing(ZZ,"x",k)

produces the following error

if second arguments is a string with no commas, then there must be no other non-optional arguments... arguments...