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- Donna Crystal Llewellyn, Craig A. Tovey, Michael A. Trick
- Discrete Applied Mathematics
- 1989

We recently noticed an error in our paper, " Local optimization on graphs " , The error is not too serious, in that all of the lemmata, propositions, and theorems are correct as given. However, the divide-and-conquer algorithm in Section 2.1, p. 159, is incomplete. The necessary changes are as follows (all changes are to p. 159): (2) In Steps 1 and 2, " S "… (More)

- Erick D. Wikum, Donna Crystal Llewellyn, George L. Nemhauser
- Oper. Res. Lett.
- 1994

- Donna Crystal Llewellyn, Jennifer Ryan
- Discrete Applied Mathematics
- 1993

- Donna Crystal Llewellyn, Craig A. Tovey
- Discrete Applied Mathematics
- 1993

- Shiow-yun Chang, Donna Crystal Llewellyn, John H. Vande Vate
- Discrete Mathematics
- 2001

Matching 2-lattice polyhedra are a special class of lattice polyhedra that include network ow polyhedra, fractional matching polyhedra, matroid intersection polyhedra, etc. In this paper we develop a polynomial-time extreme point algorithm for ÿnding a maximum cardinality vector in a matching 2-lattice polyhedron.

- Donna Crystal Llewellyn, Craig A. Tovey, Michael A. Trick
- Discrete Applied Mathematics
- 1993

- Donna Crystal Llewellyn, Leslie E. Trotter
- Math. Oper. Res.
- 1989

This is the first in a series of papers that explores a class of polyhedra we call 2-lattice polyhedra. 2-Lattice polyhedra are a special class of lattice polyhedra that include network flow polyhedra, fractional matching polyhedra, matroid intersection polyhedra, the intersection of two polyma-troids, etc. In this paper we show that the maximum sum of… (More)

- Donna Crystal Llewellyn
- Discrete Applied Mathematics
- 1987

- Shiow-yun Chang, Donna Crystal Llewellyn, John H. Vande Vate
- Discrete Mathematics
- 2001

Two-lattice polyhedra are a special class of lattice polyhedra that include network ow poly-hedra, fractional matching polyhedra, matroid intersection polyhedra, the intersection of two polymatroids, etc. In this paper we show that the maximum sum of components of a vector in a 2-lattice polyhedron is equal to the minimum capacity of a cover for the… (More)

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