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how to check maximal ideals in ring of two variables

When I tried the following:

R.<x, y="">= QQ[ ],

I= R.ideal([x, y]),

I.is_prime()

I.is_maximal()

It is running true for I.is_prime but there is an error message when I am running I.is_maximal. It is happening for ring of integers as well. For ring of univariate polynomials, the same command is not giving any error.

how to check maximal ideals in ring of two variables

When I tried the following:

R.<x, y="">= y>= QQ[ ], 

] I= R.ideal([x, y]),

I.is_prime()

I.is_maximal()

y]) I.is_prime() I.is_maximal()

It is running true for I.is_prime but there is an error message when I am running I.is_maximal. It is happening for ring of integers as well. For ring of univariate polynomials, the same command is not giving any error.