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: