Traceback (most recent call last):\n File "/var/folders/44/xrn2r2n539lcfpfq4mb99p48hlq2mb/T/marimo_98690/__marimo__cell_vblA_.py", line 9, in <module>\n $$ A = \\begin{amatrix} 4 & 1 \\\\ 6 & 3 \\end{bmatrix} $$\n ^^^^^^^\nNameError: name 'amatrix' is not defined\n