Grammar and Real-numbers I am curious about following question. I've read other threads but the problem is slightly different:
Is the set of real numbers a language?

So my question is:

If I have a grammar, as defined in https://en.wikipedia.org/wiki/Formal_grammar#The_syntax_of_grammars


G = (P,N,S,$\sum$)


P-production rules
N-non terminals 
S- StartSymbol-
$\sum$ -terminal symbols



is it possible to have the set of real numbers in the set of terminal symbols?
The definition of a grammar on wikipedia says no. 

Is it possible to define it otherwise?
You could use the digits $\{0,\dots,9\} =: \Sigma$ as alphabet and consider infinite words. A word corresponds then to a real number. Those are known as $\omega$ languages link. There are omega-regular languages too. 

Edit: The set of all real numbers, $\Sigma^\omega$, forms an $\omega$-regular language of course.