User:Wguynes/Sandbox
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Some matrix testing.
Failed to parse (unknown function "\multicolumn"): {\displaystyle \begin{bmatrix} a & \multicolumn{1}{c|}{b}} & c \\ d & \multicolumn{1}{c|}{e}} & f \\ g & \multicolumn{1}{c|}{h}} & i \end{bmatrix} }