View source for Co-basis

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A [[basis]] of a dual or [[adjoint space]].

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A co-basis is also called a ''dual basis''. Often the terminology  "dual basis"  or  "co-basis"  of $E^*$ is used to denote a basis $(e_i^*)$ of $E^*$ such that $e_i^*(e_j)=\delta_{ij}$ (the [[Kronecker delta]]), where $(e_i)$ is a given basis of $E$. The pair $(e_i),(e_i^*)$ is referred to as a pair of dual bases.