202 



Prof. F. Y. Edgeworth on 



tains to a sum of ten random digits (it is V 165). Accordingly 

 the equiprobable curves are 



^ + (gi-fe) 2 = Qonflt 



or 





= const. 



Reducing to units of modulus by putting 





^2c' 



we have 



2a?! 2 — 2 \/ 2^2 + 2^2; 



whence p 12 = —-=. In like manner it can be shown that 



v 2 



/>13 



= V? ^ = VJ ^ 23= V3' P^ = VI' ^Vf 



Thus, for the determinant which is the reciprocal of the 

 discriminant, we have 



A '= A ' VI VI VI 



: V? A > A \/| VI 



VI VI A - VI 



VI VI VI A 



/?j! = A 



'■ V »■ V j 





Vt ' vi 



-A 



vi' Vr ' 





