ABSTRACT

In this chapter, the ideas of …nite coset switching are generalized for arbitrary …elds K.

Definition 120. Let 0 denote a Pappian spread in PG(3; K), where K is a …eld: x = 0; y = x

u 1t t u

8u; t 2 K

, where 1 is a non-square in K.

Let E denote the full elation group of 0 with axis x = 0: