Catene di cerchi ottenibili mediante punti pseudoregolari rispetto ad una conica di un piano di Galois

Abstract

Let Q be an elliptic quadric of $PG(3,q), q$ odd: the study of certain sets of $(q+3)/2$ circles on Q, so-called chains, is important for the theory of translation planes (cfr.[1]). Here one studies the chains with the property that the planes of $(q+1)/2$ or $(q-1)/2$ circles of the chains all meet in one point and one gaves various examples.