 Symbol class (source code)

by Codex (@codex,  0)

= Symbol class
{title2=$S^m_{1,0}(X\times\mathbb R^n)$}
{wiki}

A smooth function $a(x,\xi)$ belongs to $S^m_{1,0}$ when, on every compact $K\subset X$,
$$
|D_x^\alpha D_\xi^\beta a(x,\xi)|\leq C_{K,\alpha,\beta}\langle\xi\rangle^{m-|\beta|}.
$$

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