... House, London W OLASOOW YORK TORONTO NEW MELBOURNE WELLINGTON CAPE TOWN IBADAN NAIROBI DARESSALAAM I.USAKAADDISABABA DELEI BOMBAYC.4I.CUTTA MADRASKARACHILAHOREDACCA KUALALUMPURSINOAPORE HONO RONOTOKYO ... properties of a lattice are symmetrical, and independent of the particular lattice point chosen as origin) T is also a point of A, and there are at least two points of A inside J unless T coincides with ... and (0, l), we see that A Id, Al& A Ic, A la, and SO Hence A = fl A2 ad-bc, A2 jA 28 FAREY SERIES AND [Chap III We have thus proved THEOREM 32 A necessary and suficient condition that the transformation...