Several sets of quaternionic functions are described and studied with respect to hyperholomorphy, addition and (non-commutative) multiplication, on open sets of ℍ, then Hamilton 4-manifolds analogous to Riemann surfaces, for ℍ instead of ℂ, are defined, and so begin to describe a class of four-dimensional manifolds.
@article{bwmeta1.element.bwnjournal-article-doi-10_4064-bc107-0-8, title = {On a noncommutative algebraic geometry}, journal = {Banach Center Publications}, volume = {104}, year = {2015}, pages = {119-131}, zbl = {06556706}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-bc107-0-8} }
(éd.). On a noncommutative algebraic geometry. Banach Center Publications, Tome 104 (2015) pp. 119-131. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-bc107-0-8/