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v2009.01.01 - Convex Optimization

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2.13. DUAL CONE & GENERALIZED INEQUALITY 145<br />

f(x, z p ) or f(x)<br />

f(x p , z) or g(z)<br />

x<br />

z<br />

Figure 51: Although objective functions from conic problems (275p) and<br />

(275d) are linear, this is a mnemonic icon for primal and dual problems.<br />

When problems are strong duals, duality gap is 0 ; meaning, functions f(x)<br />

and g(z) (dotted) kiss at saddle value, as depicted at center. Otherwise,<br />

dual functions never meet (f(x) > g(z)) by (273). Drawing by Kieff.

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