Paper 3, Section I, 1G1 G1GGroups, Rings and Modules | Part IB, 2019Prove that the ideal (2,1+−13)(2,1+\sqrt{-13})(2,1+−13) in Z[−13]\mathbb{Z}[\sqrt{-13}]Z[−13] is not principal.Typos? Please submit corrections to this page on GitHub.