| − | The complex numbers are numbers of the form <math> a + bi </math> where <math> a </math> and <math> b </math> are real numbers and <math> i </math> is a square root of -1. The complex numbers form an [[algebraic closure|algebraicly closed]] [[field (mathematics)|field]] but do not permit a non-trivial ordering that is preserved under operations. | + | The complex numbers are numbers of the form <math> a + bi </math> where <math> a </math> and <math> b </math> are real numbers and <math> i </math> is a square root of -1. The complex numbers form an [[algebraic closure|algebraically closed]] [[field (mathematics)|field]] but do not permit a non-trivial ordering that is preserved under operations. |