Let $(\Sigma^*,\cdot)$ be the set of all strings over an alphabet $\Sigma$ with the concatenation operation "$\cdot$". Any non-empty subset \(L\subseteq (\Sigma^*,\cdot)\) is called a language over the alphabet \(\Sigma \).
Examples: 1
Applications: 1
Branches: 2
Chapters: 3 4 5
Corollaries: 6
Definitions: 7 8 9 10
Examples: 11
Theorems: 12 13
