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\stopformula
</context>
A second version, with {{cmd|startmatrix}} and using {{cmd|TT}} to define indexes.
<context source="yes">
\startformula
\startmatrix[left={\left[},right={\right]}]
\TT {\bi col 1} \TT {\bi col 2} \TT {\bi col 3}\NR
\NC a_{11} \NC a_{12} \NC a_{13} \NR
\NC a_{21} \NC a_{22} \NC a_{23} \NR
\NC a_{31} \NC a_{32} \NC a_{33} \NR
\stopmatrix
→Border matrices with {{cmd|startbbordermatrix}}
\startformula
\startbbordermatrix
\NC \TT NC {\bi col 1} \TT NC {\bi col 2} \TT NC {\bi col 3}\NR\NC row 1 \NC a_{11} \NC a_{12} \NC a_{13} \NR\NC row 2 \NC a_{21} \NC a_{22} \NC a_{23} \NR\NC row 3 \NC a_{31} \NC a_{32} \NC a_{33} \NR
\stopbbordermatrix
\stopformula
</context>
