3.19 Nonnegative weighted sums and integrals. (a) Show that f(x) = E_, aixji] is a convex function of x, where a1 > a2 > · ar > 0, and xja] denotes the ith largest component of x. (You can use the fact that f(x) = Ei=1*1] ... is convex on R".) (b) Let T(x,w) denote the trigonometric polynomial T(x,w) = x1 + x2 cos w + x3 Cos 2w + ...+ xn cos(n – 1)w. Show that the function r2 S(z) = – / log T(x,w) dw is convex on {x € R" | T(x,w) > 0, 0

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter9: Systems Of Equations And Inequalities
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3.19 Nonnegative weighted sums and integrals.
(a) Show that f(x)
ar > 0, and |2] denotes the ith largest component of x. (You can use the fact that
f (x) = E, x1a] is convex on R".)
2- aixji] is a convex function of x, where a1 > a2 > ·..>
(b) Let T(x,w) denote the trigonometric polynomial
T(x,w) = x1 + x2 cos w + x3 cos 2w + ... + xn cos(n – 1)w.
Show that the function
c2n
f(x) = - | log T(x,w) dw
is convex on {x € R" | T(x,w) > 0, 0<w < 27}.
Transcribed Image Text:3.19 Nonnegative weighted sums and integrals. (a) Show that f(x) ar > 0, and |2] denotes the ith largest component of x. (You can use the fact that f (x) = E, x1a] is convex on R".) 2- aixji] is a convex function of x, where a1 > a2 > ·..> (b) Let T(x,w) denote the trigonometric polynomial T(x,w) = x1 + x2 cos w + x3 cos 2w + ... + xn cos(n – 1)w. Show that the function c2n f(x) = - | log T(x,w) dw is convex on {x € R" | T(x,w) > 0, 0<w < 27}.
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