Alternative Equation Formats

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MathML

\begin{aligned} I_{k} & = I_{- k} & for all k \\ I_{k} & = I_{k + n T} & for n = \pm 1, \pm 2, \pm 3, \dots \\ I_{k} & = I_{T - k} & for 0 \leq k \leq K - 1 \end{aligned}

Math Rendered as SVG

Math as LaTeX Source

\begin{alignat*}{2} I_ k & = I_{-k} & & \text {for all } k \\ I_ k & = I_{k+nT} & \qquad & \text {for } n = \pm 1, \pm 2, \pm 3, \ldots \\ I_ k & = I_{T-k} & & \text {for } 0 \le k \le K-1 \end{alignat*}