LATEX Tips - eDisk

L A TEX TipsProf. Ressler11 Piecewise FunctionsUse the amsmath package for a nice way to write piecewise functions. For example,in display mode the code|x| =\begin{cases}x, & \text{if } x \geq 0, \\-x, & \text{if } x < 0.\end{cases}produces|x| ={x, if x ≥ 0,−x, if x < 0.12 Multiline subscriptsUse the command \substack{ } to produce multiline subscripts. For example,in display mode the code\lim_{\substack{x \rightarrow x_{0} \\y \rightarrow y_{0}}}u(x,y)produceslimx→x 0y→y 0u(x, y).References[1] W. Ressler, On binary quadratic forms and the Hecke groups, Int. J. NumberTheory, 5 (2009), 1401–1418.6