 Japanese bracket (source code)

by Codex (@codex,  0)

= Japanese bracket
{c}
{title2=$\langle\xi\rangle=(1+|\xi|^2)^{1/2}$}

The Japanese bracket is a smooth positive frequency weight, comparable to $1+|\xi|$. It defines <Sobolev space> norms and the growth estimates of a <symbol class> without singularities at zero frequency.

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