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May 21, 2022 at 3:56 history edited Vincent Granville CC BY-SA 4.0
deleted 2 characters in body
Nov 11, 2020 at 7:06 history edited Vincent Granville CC BY-SA 4.0
Added counter-example section
Nov 10, 2020 at 18:46 history edited Vincent Granville CC BY-SA 4.0
Fixed typo in last formula for $A_k$
Nov 10, 2020 at 18:27 comment added Vincent Granville Also wondering how this is connected to wavelets (en.wikipedia.org/wiki/Wavelet).
Nov 10, 2020 at 17:09 comment added Vincent Granville I just realized this can be generalized to multidimensional functions whose values are known only on a lattice. It is somewhat related to kriging techniques and can even be generalized if values of $f(s,t)$ are known only at arbitrary (random) locations. It provides a robust, well-conditioned interpolation technique.
Nov 10, 2020 at 7:29 history asked Vincent Granville CC BY-SA 4.0