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v2007.11.26 - Convex Optimization

v2007.11.26 - Convex Optimization

v2007.11.26 - Convex Optimization

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2.4. HALFSPACE, HYPERPLANE 69tradition(a)Yy paH +H −∂H −nontraditional(b)Yy pãH −H +∂H +Figure 22: (a) Hyperplane ∂H − (109) supporting closed set Y ∈ R 2 .Vector a is inward-normal to hyperplane with respect to halfspace H + ,but outward-normal with respect to set Y . A supporting hyperplane canbe considered the limit of an increasing sequence in the normal-direction likethat in Figure 21. (b) Hyperplane ∂H + nontraditionally supporting Y .Vector ã is inward-normal to hyperplane now with respect to bothhalfspace H + and set Y . Tradition [148] [232] recognizes only positivenormal polarity in support function σ Y as in (109); id est, normal a ,figure (a). But both interpretations of supporting hyperplane are useful.

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