@article{Arzhantsev_Petravchuk_2007, title={Closed polynomials and saturated subalgebras of polynomial algebras}, volume={59}, url={https://umj.imath.kiev.ua/index.php/umj/article/view/3414}, abstractNote={The behavior of closed polynomials, i.e., polynomials $f ∈ k[x_1,…,x_n]∖k$ such that the subalgebra $k[f]$ is integrally closed in $k[x_1,…,x_n]$, is studied under extensions of the ground field. Using some properties of closed polynomials, we prove that, after shifting by constants, every polynomial $f ∈ k[x_1,…,x_n]∖k$ can be factorized into a product of irreducible polynomials of the same degree. We consider some types of saturated subalgebras $A ⊂ k[x_1,…,x_n]$, i.e., subalgebras such that, for any $f ∈ A∖k$, a generative polynomial of $f$ is contained in $A$.}, number={12}, journal={Ukrains’kyi Matematychnyi Zhurnal}, author={Arzhantsev, I. V. and Petravchuk, A. P.}, year={2007}, month={Dec.}, pages={1587–1593} }