Question: Exercise 7.9.16. Prove PA-Vs Exercise 6.9.9, that (a) 123 = 12 4 1323 12 13 4 12 23 (b) 1234 = 4124134234 12 134 4

Exercise 7.9.16. Prove PA-V’s Exercise 6.9.9, that

(a) ρ12·3 =

ρ12− 4 ρ13ρ23 1−ρ2 13 4

1−ρ2 23

(b) ρ12·34 =

4ρ12·4−ρ13·4ρ23·4 1−ρ2 13·4 4

1−ρ2 23·4

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