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==Pronuntiatum theorematis==
In quaque [[copia vacua|copia non vacua]],<!--nonempty set--> <math>C \subset X</math> in nonnullo [[spatium lineare|spatio lineari]] <math>X</math>, tum conus bipolaris <math>C^{oo} = (C^o)^o</math> datur a
:<math>C^{oo} = \operatorname{cl}(\operatorname{co} \{\lambda c: \lambda \geq 0, c \in C\})</math>
ubi <math>\operatorname{co}</math> [[cortex convexus|corticem convexum]]<!--c. hull--> denotat.<ref name="BorweinLewis"/><ref name="Boyd">{{cite book|title=Convex Optimization|first1=Stephen P.|last1=Boyd|first2=Lieven|last2=Vandenberghe|year=[[2004]]|publisher=Cambridge University Press|isbn=9780521833783|url=http://www.stanford.edu/~boyd/cvxbook/bv_cvxbook.pdf|format=pdf|accessdate=[[15 Octobris]] [[2011]]|pages=51–53}}.</ref>
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