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Published byLeslie Stallman Modified over 2 years ago

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Branch and Bound See Beale paper

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Example: Maximize z=x1+x2 x2 x1

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Solve First LP problem: Solution is [1.5 2.5] x2 x1

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[1.5 2.5] X1 <= 1 [1 1.5] x2 x1 X1 >= 2 [2 1.5], z=3.5, z=2.5

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[1.5 2.5] X1 <= 1 [1 1.5] x2 x1 X1 >= 2 [2 1.5], z=3.5, z=2.5 X2 = 2 No solution [2.25, 1], z=3.25

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[1 1.5] x2 x1 [2 1.5], z=3.5, z=2.5 X2 = 2 No solution [2.25, 1], z=3.25 X1 = 3 [2,1], z=3 No solution

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Example: Maximize x1+x2 x2 x1

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S Sbar Sums edges out of S >= 2

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In TSP, we solve LP problem with constraint {each vertex has 2 edges incident to it} and we add just relevant ‘subtour inequalities’ to cut off any subtour solutions. So each time we solve LP and if we get a subtour solution, we add the specific subtour inequality to cut off that solution and resolve LP. This continues until we get a final tour solution.

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Objective Function to be minimized Unbounded

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Infeasible solution

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LP feasible, but integer infeasible

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