Question 482541
You could notate it something like


*[tex \LARGE (x \in \mathbb{R} : \forall k \not\in \mathbb{Z}, x = \frac{(2k + 1)\pi}{2})]


(The () should be {}, LaTeX interprets curly braces differently so I could not type them without changing the {} to a string).


This is set-builder notation representing "the set of all real x such that for all non-integer k, x = (2k+1)pi/2."