Linear programming: rank lemma (incomplete)

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For an extreme-point solution, the maximum number of linearly independent tight constraints equals the number of non-zero variables.

A useful corollary is that the number of non-zero variables in an extreme-point solution is at most the number of constraints.

Proof can be found in the book [iterative-methods], Lemma 2.1.4, page 14.

iterative-methods
Lau LC, Ravi R, Singh M.
Iterative methods in combinatorial optimization
Cambridge University Press; 2011 Apr 18.

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