Description of function here https://en.wikipedia.org/wiki/Thomae%27s_function.
DONE
- Proof of periodicity
- Proof of Continuity at irrationals
- Proof of discontinuity at rationals.
TODO
- Proof of nowhere differentiable.
- Proof of Riemann integrable and eq to 0 for any interval
- Proof of rational numbers are local maximums