[Dune] question about integration element

[Aleksejs Fomins]

Dear Dune,

The definition of integrationElement is

I = sqrt(| det( J^T J) |)

And the volume is given by

dV' = I dV

Wikipedia tells me that the volume should be

dV' = det(J) dV

What am I missing?

Thank you,
Aleksejs

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