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A justification for the use of finite elements with edge-attached degrees of freedom (edge-elements) is sought in some mathematical structures that underlie eddy-current theory. An introduction to so-called mixed methods in magnetostatics is given, and two dual methods for eddy-current computations, both making use of edge elements, are shown to derive from these considerations.>
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A. Bossavit (1988) studied this question.
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