Ideals of regular functions of a quaternionic variable
  In this paper we prove that, for any $n\in \mathbb N$, the ideal generated by $n$ slice regular functions $f_1,\ldots,f_n$ having no common zeros concides with the entire ring of slice regular functions. The proof required the study of the non-commutative syzygies of a vector of regular functions, that manifest a different character when compared with their complex counterparts. 
Graziano Gentili, Giulia Sarfatti, Daniele C. Struppa
math.CV