Solution
= Solution
True. If $s>t$, then $\langle\xi\rangle^{2t}\leq\langle\xi\rangle^{2s}$, so $H^s(\mathbb R^n)\subset H^t(\mathbb R^n)$ continuously.
= Solution
True. If $s>t$, then $\langle\xi\rangle^{2t}\leq\langle\xi\rangle^{2s}$, so $H^s(\mathbb R^n)\subset H^t(\mathbb R^n)$ continuously.