User:SamSim/TeXSandbox

${\displaystyle f_{n}(x)=\left\{{\begin{array}{ll}x-{\frac {1}{n}}\lfloor nx\rfloor &{\text{ if }}\lfloor nx\rfloor \equiv 0{\bmod {2}}\\{\frac {1}{n}}\lfloor nx\rfloor -x+{\frac {1}{n}}&{\text{ if }}\lfloor nx\rfloor \equiv 1{\bmod {2}}\end{array}}\right.}$