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Duality Theory                                   

Primal ( Dual)

Maximize  Z = c1x1 + c2x2 +...+cnxn

subject to

a11x1 + a12x2 +...+ a1nxn  ≤ b1
a21x1 + a22x2 +...+ a2nxn  ≤ b2
    .             .                 .             .
    .             .                 .             .
    .             .                 .             .
am1x1 + am2x2 +...+amnxn ≤ bm
  and                 x1,x2...,xn  ≤ 0

Dual (Primal)

Maximize     Z = b1y1 + b2y2 +...+bmym

subject to

a11y1 + a21y2 +...+am1y≥ c1
a12y1 + a22y2 +...+ am2ym ≥ c2
    .             .                 .             .
    .             .                 .             .
    .             .                 .             .
a1ny1 + a2ny2 +...+ amnym  ≥ cn
                       y1, y2..., ym  ≥ 0.