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v2007.09.13 - Convex Optimization

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624 APPENDIX E. PROJECTION❇❇❇❇❇❇❇❇ x ❜❜R n⊥ ❇❙ ❜❇❇❇❇◗◗◗◗ ❙❙❙❙❙❙ ❜❜❜❜❜z❜y❜❜❜❜✧ ✧✧✧✧✧✧✧✧✧✧✧✧✧ R n❜❜C❜❜❜❜❜❜x −z ⊥ z −y ❜❇❜❇❇❇❇ ❜❜❜❜❜ ✧ ✧✧✧✧✧✧✧✧✧✧✧✧✧Figure 120: Closed convex set C belongs to subspace R n (shown boundedin sketch and drawn without proper perspective). Point y is uniqueminimum-distance projection of x on C ; equivalent to product of orthogonalprojection of x on R n and minimum-distance projection of result z on C .

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