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===6.4.2 Contact Physics – Formulas===
*'''Constriction resistance''' <math><br />R<sub>e</sub> R_e = \rho/2a</math>
(Single spot contact according to Holm; circular touching spot between clean
contact surfaces)
<math>R<sub>e</sub> R_e = \rho/2Na</math>
(Multi-spot contact according to Holm without influence between the N
individual spots)
