@article{Redfield_2014, title={Some properties of positive derivations on f-rings II}, volume={2}, url={https://sciencepubco.com/index.php/IJAMS/article/view/3466}, DOI={10.14419/ijams.v2i3.3466}, abstractNote={A counterexample is provided to show that Theorem 10(b)(i) in the article “Some properties of positive derivations on f-rings” by Henriksen and Smith is false. Correct proofs are given for some results in the paper that use Theorem 10(b)(i) in their proofs. Keywords: lattice-ordered ring, f-ring, positive derivation, polynomial ring.}, number={3}, journal={International Journal of Advanced Mathematical Sciences}, author={Redfield, R. H.}, year={2014}, month={Oct.}, pages={132–136} }