Numbers and Variables

Natural Math allows numbers and one letter variables written in the usual way. There is also the complete collection of greek letters, both lower and upper case, and infinity. There are also the dots.

30.45 , x , pi, Pi, Phi, phi, infinity, ...,dots

$$30.45 , \ x , \ \pi , \ \Pi , \ \Phi , \ \phi , \ \infty , \ \dots , \ \dots$$