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In the past, due to the technical limitations of early computers, and the lack of international standardization on the Internet, computer users were limited to using English and the Latin alphabet. However, this historical limitation is less present today, due to innovations in internet infrastructure and increases in computer speed.
The Chomsky hierarchy in the fields of formal language theory, computer science, and linguistics, is a containment hierarchy of classes of formal grammars. A formal grammar describes how to form strings from a language's vocabulary (or alphabet) that are valid according to the language's syntax.
In computer science, communicating sequential processes (CSP) is a formal language for describing patterns of interaction in concurrent systems. It is a member of the family of mathematical theories of concurrency known as process algebras, or process calculi , based on message passing via channels .
The OWL language, based on description logic, is an example. There is also work on mapping some version of English (or another natural language) automatically to and from logic, as well as executing the logic directly. Examples are Attempto Controlled English, and Internet Business Logic, which do not seek to control the vocabulary or syntax. A ...
The equivalence of unrestricted grammars to Turing machines implies the existence of a universal unrestricted grammar, a grammar capable of accepting any other unrestricted grammar's language given a description of the language. For this reason, it is theoretically possible to build a programming language based on unrestricted grammars (e.g. Thue).
A simple example can be formulated as a series of increasingly difficult natural language queries to locate a target document that may or may not exist locally on a known computer system. Example queries: 1) Locate any file in the known directory "/usr/local/funny". 2) Locate any file where the word "funny" appears in the filename.
In logic, mathematics, computer science, and linguistics, a formal language consists of words whose letters are taken from an alphabet and are well-formed according to a specific set of rules called a formal grammar. The alphabet of a formal language consists of symbols, letters, or tokens that concatenate into strings called words. [1]
The language () = {} defined above is not a context-free language, and this can be strictly proven using the pumping lemma for context-free languages, but for example the language {} (at least 1 followed by the same number of 's) is context-free, as it can be defined by the grammar with = {}, = {,}, the start symbol, and the following ...