Ma, Jingjing2020-09-032020-09-032015J. Ma, Directed partial orders on real quaternions, Quaestiones Mathematicae (2015) (12/14/2015 published online first)https://hdl.handle.net/10657.1/2448It is shown that a division ring of real quaternions can be made into a partially ordered ring with a directed partial order.Directed partial order, real quaternionsArticle