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Formal languages
The formal language of mathematics, logic and science indicates the final set of words (ie words, the final length) above a certain alphabet. Instead of the word is sometimes used the word string. The definition of a language may change depending on the context in which scientific field to use.
Empty word (ie word, which consists of a zero number of characters) and the means, and ? ?. Although the alphabet is a finite set, and every word is the final set, the language may not be final, because the length of words may not be limited to the top.
Alphabet is usually represented by a symbol of ?. Minutes ? * denotes the language, containing all the words of the alphabet, including empty words. Each language Lnad some alphabet is a subset of ? ? * language.
