A Meaning of the Riemman Tensor notation in the choquet Bruhat

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Hello
I have been going through the cosmology chapter in Choquet Bruhats GR and Einstein equations and in definition 3.1 of chapter 5 she defines the sectional curvature with a Riemann( X, Y;X, Y) (X and Y two vectors)
I don't understand this notation, regarding the use of the semi colon, is it a derivative or just a way of saying Riemann( X, Y, X, Y)?
 

martinbn

Science Advisor
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No derivative. That's just the Riemann tensor.
 

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