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when toggle format what by license comment
Jun 3, 2022 at 15:58 comment added Denis Serre @thedude This is the Hessian matrix.
Jun 3, 2022 at 13:50 comment added thedude What is the notation D$^2$?
Jun 3, 2022 at 13:32 history answered Denis Serre CC BY-SA 4.0