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$$\large{\begin{gather*}\normalsize\begin{pmatrix}a_{11} & \cdots & a_{1j} & \cdots & a_{1n}\\\vdots & \ddots & \vdots & \ddots & \vdots\\a_{i1} & \cdots & a_{ij} & \cdots & a_{in}\\\vdots & \ddots & \vdots & \ddots & \vdots\\a_{m1} & \cdots & a_{mj} & \cdots & a_{mn}\end{pmatrix}\end{gather*}}$$

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