Calibration of Euclidean Steiner Trees by Currents
in collaboration with A. Massaccesi and B. Velichkov
You can find illustrations of counter examples of calibration identification on the following link
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Representation of an optimal calibration associated to three equilateral points
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Representation of an optimal calibration associated to the four vertices of a square
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Representation of an optimal calibration associated to the five vertices of a Pentagon
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Representation of an optimal calibration associated to the six vertices of an Hexagon
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Representation of an optimal calibration associated to a configuration made of six points
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Representation of an optimal calibration associated to a regular polygon of 7 vertices