$$ \boldsymbol{P}_{1,0}=\boldsymbol{F}\boldsymbol{P}_{0,0}\boldsymbol{F}^T+\boldsymbol{Q}\ =\left[\begin{matrix}22.25&1.25\\1.25&0.25\\\end{matrix}\right]+\left[\begin{matrix}6.25&2.5\\2.5&1\\\end{matrix}\right]\ =\left[\begin{matrix}28.5&3.75\\3.75&1.25\\\end{matrix}\right] $$
这位萨尔瓦多公民去年被误遣返回原籍国后，其案件已成为移民政策辩论的焦点。自他重返美国以来，持续抵制国土安全部提出的将其遣往多个非洲国家的二次驱逐令。
，详情可参考易歪歪
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hm.sh provides a compact shell script that discovers Makefile targets and presents them through fzf:，这一点在todesk中也有详细论述
，这一点在zoom中也有详细论述