192

PONTIFICIAE ACADEMIAE SCIENTIARVM SCRIPTA VARIA - 28

It is now easy to determine the inverse of 9A + R’R, since

1d

x
LS

A
+
yr
AS L340
AEE 2

SK
1%
rar
À ae
pv
4024
”

The typical (¢, #)" element is therefore

Min (t,t)
5 NEHV—2i —
I

WE] _ ptt

)

and so we obtain for the typical element of (gA + R’R)-—!:

(A.9) (gA + RR) =

rT —

St] test
A) ergy T= An

771 Theil - pag. 28