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Unformatted text preview: C . In class we saw how to nd a circulation such that + is the desired ow by using a single shortest path computation in the dual with respect to the lengths c- (residual capacities), which might be negative. Show how to nd such a circulation without using an algorithm for shortest paths with negative lengths. 2. Present a drawing of an embedding of K 3 , 3 in the projective plane, specify its embedding scheme, and list its facial walks....
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- Fall '11