Suppose the variable x 1 can assume any real value. Show that the following substitution using nonnegative

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Suppose the variable x1 can assume any real value. Show that the following substitution using nonnegative variables x2 and x3 permits x1 to assume any real value.

and X1 = X2-X3, X  0 where x is unconstrained and X3  0

Thus, if a computer code allows only nonnegative variables, the substitution allows for solving the linear program in the variables x2 and x3 and then recovering the value of the variable x1.

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A First Course In Mathematical Modeling

ISBN: 9781285050904

5th Edition

Authors: Frank R. Giordano, William P. Fox, Steven B. Horton

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