PAPER / ARXIV:2609.04275

An explicit non-elementary matrix over a bivariate Laurent polynomial ring

Vasiliy Ionin , Artem Semidetnov

Álgebra comutativa · cruzada Teoria dos grupos K-teoria e homologia · cruzada

RESUMO

Let $F$ be the fraction field of a discrete valuation ring. We give an explicit matrix in $\mathrm{SL}_2(F[X^{\pm1},Y^{\pm1}])\setminus \mathrm{E}_2(F[X^{\pm1},Y^{\pm1}])$. The proof of non-elementarity is based on techniques developed by Peter Abramenko in his preprint arXiv:0808.1095v1 .

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