Reversal of the empty string produces the empty string. The set of all strings forms a free monoid with respect to ⋅ and ε. The empty string is the identity element of the concatenation operation. a set of strings) that contains no strings, not even the empty string. The empty string should not be confused with the empty language ∅, which is a formal language (i.e. In formal treatments, the empty string is denoted with ε or sometimes Λ or λ.
There is only one empty string, because two strings are only different if they have different lengths or a different sequence of symbols. The empty string is the special case where the sequence has length zero, so there are no symbols in the string. Formally, a string is a finite, ordered sequence of characters such as letters, digits or spaces.
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