We present a class of counterexamples to the Cancellation Problem over arbitrary commutative rings, using non-free stably free modules and locally nilpotent derivations.
@article{bwmeta1.element.bwnjournal-article-doi-10_4064-ap76-1-8, author = {Arno van den Essen and Peter van Rossum}, title = {A class of counterexamples to the Cancellation Problem for arbitrary rings}, journal = {Annales Polonici Mathematici}, volume = {77}, year = {2001}, pages = {89-93}, zbl = {1033.14038}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-ap76-1-8} }
Arno van den Essen; Peter van Rossum. A class of counterexamples to the Cancellation Problem for arbitrary rings. Annales Polonici Mathematici, Tome 77 (2001) pp. 89-93. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-ap76-1-8/