Figure 3
Geometric interpretation of the vector decomposition [bold xi] = [xi]1e1 + [xi]2e2 + [xi]3e3, subject to the constraint [xi]1 + [xi]2 + [xi]3 = 0. The components [xi]1, [xi]2, [xi]3 are defined by the orthogonal projections on the axes e1, e2, e3, with the appropriate sign and the scaling factor of 2/3.  [article HTML]

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