Prove Theorem 7.2.20. a. Show that, using (7.2.19), we can write and, since (r+1) is a maximum,
Question:
a. Show that, using (7.2.19), we can write
and, since (r+1) is a maximum,
When is the inequality and equality?
b. Now use Jensen's inequality to show that
Which together with part (a) proves the theorem.
Transcribed Image Text:
E [logk(Xlar-+ i ) , y)@r), У] E [log k(XIjr)' y)0 r),y].
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