3.17 Supposep< 1, p # 0. Show that the function 1/p f(x) = i=1 R + is concave. This includes as special cases f(x) = (E"1 x;²)² and the harmonic mean f(x) = (E" 1/x;)-1. Hint. Adapt the proofs for the log-sum-exp with dom f %3D vi=1 vi=! co 1

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter4: Polynomial And Rational Functions
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3.17 Suppose p < 1, p # 0. Show that the function
1/p
(E-)
n
f (x) = ?
with dom f = R+ is concave. This includes as special cases f(x) = (E"_, x;12)² and
the harmonic mean f(x) = (E" 1/x;)¬1. Hint. Adapt the proofs for the log-sum-exp
function and the geometric mean in §3.1.5.
%3D
Transcribed Image Text:3.17 Suppose p < 1, p # 0. Show that the function 1/p (E-) n f (x) = ? with dom f = R+ is concave. This includes as special cases f(x) = (E"_, x;12)² and the harmonic mean f(x) = (E" 1/x;)¬1. Hint. Adapt the proofs for the log-sum-exp function and the geometric mean in §3.1.5. %3D
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