Dual Basis (original) (raw)
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Given a contravariant basis , its dual covariant basis is given by
where is the metric and
is the mixed Kronecker delta. In Euclidean space with an orthonormal basis,
so the basis and its dual are the same.
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Cite this as:
Weisstein, Eric W. "Dual Basis." FromMathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/DualBasis.html