Alternative Equation Formats

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MathML

\begin{array}{rcl} τ_{b} & = & τ / p \\ τ_{w} & = & τ_{b} - τ \end{array}

\begin{eqnarray*} \tau _ b & =& \tau / p \\ \tau _ w & =& \tau _ b - \tau \end{eqnarray*}