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Extremum problems for eigenvalues of discrete Laplace operators

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12 REN GUO<br />

[R]<br />

Samuel Rippa, Minimal roughness property <strong>of</strong> the Delaunay triangulation. Comput.<br />

Aided Geom. Design 7 (1990), no. 6, 489–497.<br />

School <strong>of</strong> Mathematics, University <strong>of</strong> Minnesota, Minneapolis, MN, 55455, USA<br />

E-mail address: guoxx170@math.umn.edu

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