# UMFPS

Acronym | Definition |
---|---|

UMFPS | United Minds for Peace Society |

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Acronym | Definition |
---|---|

UMFPS | United Minds for Peace Society |

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where f is the max-flow of the UMFP. (Henceforth, we will refer to the quantity C(U, [bar]U)/|U||[bar]U| as the ratio cost of a cut <U, [bar]U>.) Since the min-cut of a UMFP is

where f is the max-flow and S is the min-cut of the UMFP.

The algorithm for finding a cut with small ratio cost is based on the linear programming dual of the UMFP. In general, the dual of a multicommodity flow problem for a graph G is the problem of apportioning a fixed amount of weight (where weights are thought of as distances) to the edges of G so as to maximize the cumulative distance between the source/sink pairs.

From the duality theory of linear programming, we know that an optimal distance function results in a total weight that is equal to the max-flow of the UMFP. Hence, by solving the dual UMFP, we can find distances d(e) that satisfy Eq.

The fact that our algorithm uses the dual UMFP to find a small cut should not be completely surprising, given the well-known relationship between the min-cut and the dual of a single commodity flow problem.

The demand for the commodity between nodes u and v is then set to be [Pi](u)[Pi](v).(7) The UMFP is a special case of a PMFP for which [Pi](u) = 1 for all nodes u [element of] V.

In a directed UMFP, we will assume that the demand from u to v is 1 for each u [is not equal to] v.

The max-flow and min-cut of a directed UMFP are related by the following theorem.

where f is the max-flow and S is the rain-cut of the UMFP.

As a consequence of this work, we have found that the max-flow of a UMFP or PMFP is nearly as large as the limit implied by the min-cut.

The dual of the short-path UMFP is the same as before except that the distance between two nodes in the distance constraint is computed using only paths with at most L edges in G.

[1997] give an alternative approach to finding balanced separators using a generalized version of the dual to the UMFP. In addition, M.

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