ComplexPlane

The Ferrero pair constructions used by Clay were often based upon geometrical models in the complex plane. Taking certain subgroups $\Phi$ of the multiplicative group of the complex numbers, various B constructions lead to traditional geometrical forms. Properties such as <i>circular</i> designs are also derived from this model, as well as <i>triangles</i>, <i>lines</i>, and <i>segments</i>.