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I have read that vector of polarisation [itex]\vec{P}[/itex] and stress tensor T are linked with equation

[itex]\vec{P}=\underline{\underline{d}} \: \underline{T}[/itex]

where d is a third-order piezoelectric tensor. Can anyone explain how you multiply a third and a second-order tensor to get a vector? A good link will also help.

Thank you,

N.

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# Product of a third- and second-order tensor.

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