rate-distortion function: derivative of a functional












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My question concerns the answer on this post: Characterisation of the rate distortion function: issue with functional derivative



What do the symbols $delta_{x',x_0}$ and $delta_{hat{x}_0,hat{x}}$ mean; in particular, how is the third line derived from the second one? Does anyone have a reference for these definitions/notation? The Wikipedia article on functional derivatives doesn't seem to have them...Thank you. (Sorry I couldn't comment on the post because I don't have enough reputation.)










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    1














    My question concerns the answer on this post: Characterisation of the rate distortion function: issue with functional derivative



    What do the symbols $delta_{x',x_0}$ and $delta_{hat{x}_0,hat{x}}$ mean; in particular, how is the third line derived from the second one? Does anyone have a reference for these definitions/notation? The Wikipedia article on functional derivatives doesn't seem to have them...Thank you. (Sorry I couldn't comment on the post because I don't have enough reputation.)










    share|cite|improve this question

























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      1








      1







      My question concerns the answer on this post: Characterisation of the rate distortion function: issue with functional derivative



      What do the symbols $delta_{x',x_0}$ and $delta_{hat{x}_0,hat{x}}$ mean; in particular, how is the third line derived from the second one? Does anyone have a reference for these definitions/notation? The Wikipedia article on functional derivatives doesn't seem to have them...Thank you. (Sorry I couldn't comment on the post because I don't have enough reputation.)










      share|cite|improve this question













      My question concerns the answer on this post: Characterisation of the rate distortion function: issue with functional derivative



      What do the symbols $delta_{x',x_0}$ and $delta_{hat{x}_0,hat{x}}$ mean; in particular, how is the third line derived from the second one? Does anyone have a reference for these definitions/notation? The Wikipedia article on functional derivatives doesn't seem to have them...Thank you. (Sorry I couldn't comment on the post because I don't have enough reputation.)







      calculus-of-variations






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      asked Nov 27 at 8:33









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