[gradschoolfail]

Thank you!

I remember seeing in the Tao book a Fourier operator that looks something like the “integral” of exp(ik^2 x).. (or exp(ik x^2), haha)

As a followup, is it possible to ELI5 roughly what Tao meant by “higher-order”?

[coherentpony]

The first paragraph of the preface on page 7 in the book gives an explicit example of “higher order”: https://terrytao.files.wordpress.com/2011/03/higher-book.pdf

[gradschoolfail]

Lollol thats what i half remembered.. i guess then what Terence Tao meant by higher order is lower order in the featured artiicle!