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. Author manuscript; available in PMC: 2010 Aug 20.

Published in final edited form as: Int J Numer Methods Eng. 2009 Aug 20;79(8):907–945. doi: 10.1002/nme.2583

Merging of node i at x_i to neighboring node j at x_j. A Appearance before merge where neighborhood Ω_i of x_i consists of N surface triangles T_k. B Appearance after merge where replacement neighborhood Ω_new consists of N–2 new surface triangles $T_{k}^{new}$ . C Deformation of surface by this merge sweeps out a volume that can be decomposed into N–2 tetrahedra _k

Inline graphic — Merging of node i at x_i to neighboring node j at x_j. A Appearance before merge where neighborhood Ω_i of x_i consists of N surface triangles T_k. B Appearance after merge where replacement neighborhood Ω_new consists of N–2 new surface triangles $T_{k}^{new}$ . C Deformation of surface by this merge sweeps out a volume that can be decomposed into N–2 tetrahedra _k