Triangular monomial derivations on k [ X 1 , X 2 , X 3 , X 4 ] have kernel generated by at most four elements
نویسنده
چکیده
It is shown that any triangular derivation on k[X1, X2, X3, X4] sending Xi to a monomial has kernel generated by at most four elements, hence is finitely generated. An explicit formula for the generators is given.
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