The empty string should not be confused with the empty language ∅, which is a formal language (i.e. a set of strings) that contains no strings, not even the empty string. The empty string has several properties: |ε| = 0. Its string length is zero. ε ⋅ s = s ⋅ ε = s. The empty string is the identity element of the concatenation operation
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Freedom on My Mind: History and Documents Freedom on My Mind offers a balance between a top-down and a bottom-up approach to history. Using both primary and secondary sources, we have written a narrative of African American history that is presented in the context of American history and the evolution of American democracy.
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