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Question: How can I define a Tensor equation ?

Question:How can I define a Tensor equation ?

Mapleliquid 20 Maple
indices tensor
2 hours ago
0

Hello,

I want to define these two equations.I know how I can define a Tensor, but how can I use a Tensor with tue diffrent indices. In one case I need u[i] , but I need also u[j]. I know also, that I need an extra command if I want to use latine letters. Can somebody write this complete for me ?

Thank you 
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