Fenchel-Young Inequality first article

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enter image description here Where could I find the 1st appearance in the community for the Fenchel-Young inequality?

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Rockafellar's fundamental "Convex Analysis" points to the following article from 1949, where the inequality is stated (although with outdated notation):

There the author regards the inequality as a generalization of the inequality of Young, which only covers the scalar, differentiable case as far as I understand. No references to previous occurrences of this result are given by Fenchel, so my guess is that the above reference is its first appearance.

For Young's inequality, from the above reference one reaches:

  • G. H. Hardy, J. E. Littlewood, G. Pôlya, "Inequalities," Cambridge (1934).
  • W. H. Young, "On classes of summable functions and their Fourier series," Proc. Royal Soc. (A), 87, pp. 225-229 (1912).