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This configuration is less stable compared to offset parallel or perpendicular geometries, which is consistent with the relative rarity of the sandwich orientation in X-ray crystal data.
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Hence the Mixedm-orientation Sandwich Problem has a solution if and only if there exists E1⊆E⊆E2 which admits an orientation (overrightarrow{E}) with (m v -d^_{A_{1}}(v) geq d^_{overrightarrow{E}}(v) geq m v -d^_{A_{2}}(v)) for all v∈V.
Then we find and orient an edge set E (E1⊆E⊆E2) with in-degree m2 (m-orientation Sandwich Problem).
(a) Them-Orientation Sandwich Problemhas aYesanswer.
"Sandwich problems on orientations," by O.D. de Gevigney, S. Klein, V.-H.
TheMixedm-orientation Sandwich Problemhas aYesanswer if and only if (15)for every subsetXofV.
We present a characterization and a polynomial-time algorithm for solving the m-orientation sandwich problem.
By Theorem 3 and Claim 2, E is a solution of the m-orientation Sandwich Problem.
This result stands in contrast to the strongly connected m-orientation sandwich problem which we show is NP-complete.
If them-Orientation Sandwich Problemhas aYesanswer, then a subsetFofE0is feasible if and only ifFis a base of the matroid(M_{bar{m}}/E_{1}). Complexity: The condition (d) of Theorem 11 can be verified in polynomial time by Theorem 4, so the m-Orientation Sandwich Problem is in P. Optimization: The minimum cost version of the problem can be solved in polynomial time.
Before studying sandwich problems on orientations of given in-degrees, let us start as a warming up by considering sandwich problems for undirected and directed graphs of given degrees.
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