Question: Exercise 6.8.9 Show that (a) 123 = 12 1323 12 13 12 23 (b) 1234 = 124134234 12 134 12 234 .

Exercise 6.8.9 Show that

(a) ρ12·3 =

ρ12−  ρ13ρ23 1−ρ2 13



1−ρ2 23

(b) ρ12·34 =

ρ12·4−ρ13·4ρ23·4 1−ρ2 13·4



1−ρ2 23·4

.

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