/ / pi\ / 3*pi \ / 5*pi\\
Or|And|0 <= x, x < --|, And|x <= 2*pi, ---- < x|, And|pi < x, x < ----||
\ \ 4 / \ 2 / \ 4 //
$$\left(0 \leq x \wedge x < \frac{\pi}{4}\right) \vee \left(x \leq 2 \pi \wedge \frac{3 \pi}{2} < x\right) \vee \left(\pi < x \wedge x < \frac{5 \pi}{4}\right)$$
((0 <= x)∧(x < pi/4))∨((pi < x)∧(x < 5*pi/4))∨((x <= 2*pi)∧(3*pi/2 < x))
pi 5*pi 3*pi
[0, --) U (pi, ----) U (----, 2*pi]
4 4 2
$$x\ in\ \left[0, \frac{\pi}{4}\right) \cup \left(\pi, \frac{5 \pi}{4}\right) \cup \left(\frac{3 \pi}{2}, 2 \pi\right]$$
x in Union(Interval.Ropen(0, pi/4), Interval.open(pi, 5*pi/4), Interval.Lopen(3*pi/2, 2*pi))