Let $R$ be an integral domain with the quotient field $K$.
Let $M$ be a finitely generated $R$-submodule in $K^n$.
Is it true that $M$ is free $R$-module?
Let $R$ be an integral domain with the quotient field $K$.
Let $M$ be a finitely generated $R$-submodule in $K^n$.
Is it true that $M$ is free $R$-module?