Alternative Equation Formats

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MathML

\begin{array}{rcl} Y_{j} (t) & = & I (X_{j} \geq t) \\ Δ_{j} (t) & = & {\begin{cases} 1 & X_{j} = t a n d Δ_{j} = 1 \\ 0 & otherwise \end{cases} \\ d (t) & = & \sum_{j} Δ_{j} (t) \end{array}

Math Rendered as SVG

Math as LaTeX Source

\begin{eqnarray*} Y_ j(t) & =& I(X_ j \geq t)\\ \Delta _ j(t) & =& \left\{ \begin{array}{ll} 1 & X_ j=t ~ ~ \mr{and}~ ~ \Delta _ j=1\\ 0 & \textrm{otherwise} \end{array} \right. \\ d(t)& =& \sum _ j\Delta _ j(t) \end{eqnarray*}