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nature of the symbols. a string (or word) over σ is any finite sequence of symbols from σ. [ ] for example, if σ = { , }, then is a string over σ. the length of a string s is the number of symbols in s (the length of the sequence) and can be any non-negative integer ; it is often denoted as |s|. the empty
their concatenation is defined as the sequence of symbols in s followed by the sequence of characters in t, and is denoted st. for example, if σ = {a, b, ..., z}, s = bear, and t = hug, then st = bearhug and ts = hugbear. string concatenation is an associative , but non- commutative operation. the empty...
https://en.wikipedia.org/wiki/String_(computer_science)
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