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Published in 2019 at "Journal of Algebra"
DOI: 10.1016/j.jalgebra.2019.05.040
Abstract: In Costa's paper published in 1977, he asks us whether every retract of $k^{[n]}$ is also the polynomial ring or not, where $k$ is a field. In this paper, we give an affirmative answer in…
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Keywords:
three variables;
retracts polynomial;
polynomial rings;
rings three ... See more keywords
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Published in 2018 at "Journal of Pure and Applied Algebra"
DOI: 10.1016/j.jpaa.2017.04.009
Abstract: Abstract We show that all retractions of polynomial algebras with sparse homogeneous parts are conjugate to the canonical ones, and as a consequence, the corresponding retracts are isomorphic to polynomial algebras.
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Keywords:
retracts polynomial;
polynomial algebras;
class retracts;