in the Paper "The multilinear restriction estimate: a shoort proof and a refinement" the author Ioan Bejenaru uses the brakets $\langle,\rangle$, for example in the inequality 2.5.
What does this notation mean?
2026-04-06 22:49:43.1775515783
Notation in harmonic analysis
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In this case these are Japanese brackets, defined most commonly as $$\langle x\rangle = (1+|x|^2)^{1/2}.$$
This should be understood as a smoother variant of $1+|x|$.