I had my lecture today about decidable languages and as I am reviewing the material I have from the university, I got quite confused about the following definition:
$\emptyset$ doesn't contain any words and is called the empty set. $\Sigma^*$ contains all possible languages from $\Sigma$, and $\Sigma$ contains all words of length 1.
Does this mean if I define a Language $L \subset \Sigma$, $L$ is the set of all Languages of length 1?
Specifically, if $\Sigma=\{0,1\}$, then the length $L$ is 2?