Alternative Equation Formats
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      Math as LaTeX Source
      
      \begin{eqnarray*} \left[ \begin{array}{ccc} r(Y1,X1) & r(Y1,X2) \\ r(Y2,X1) & r(Y2,X2) \\ r(Y3,X1) & r(Y3,X2) \\ \end{array} \right] \end{eqnarray*}