vault backup: 2026-08-04 13:12:55
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@@ -23,7 +23,7 @@ A word (or _string_) is a finite sequence $w = a_1 a_2 ... a_n$ if characters fr
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> We will use small letters to describe strings that are part of a language.
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> [!EXAMPLE]
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> $"aa", "ab", "bba"$ and $"baab"$ are strings over $Sigma = {a, b}.
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> $"aa", "ab", "bba"$ and $"baab"$ are strings over $Sigma = {a, b}$.
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#### Length of a string
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The _length_ $abs(x)$ of a string $x = a_1 ... a_n$ is its number $abs(x) = n$ of characters.
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