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In contemporary publications following Hopcroft and Ullman (1979), [2] an indexed grammar is formally defined a 5-tuple G = N,T,F,P,S where N is a set of variables or nonterminal symbols, T is a set ("alphabet") of terminal symbols, F is a set of so-called index symbols, or indices, S ∈ N is the start symbol, and; P is a finite set of ...
Multiple non-referential indices can be employed to index the social identity of a speaker. An example of how multiple indexes can constitute social identity is exemplified by Ochs discussion of copula deletion: "That Bad" in American English can index a speaker to be a child, foreigner, medical patient, or elderly person. Use of multiple non ...
Hopcroft and Ullman tend to consider indexed languages as a "natural" class, since they are generated by several formalisms, such as: [9]. Aho's indexed grammars [1]; Aho's one-way nested stack automata [10]
The global index languages are a subset of the context sensitive languages, and a superset of the context free languages. It is known that GIGs can generate the MIX/Bach language { p ( a n b n c n ) : n ≥ 1 } {\displaystyle \{p(a^{n}b^{n}c^{n}):n\geq 1\}} , where p is the string permutation function, which is conjectured (but not proven) not ...
In morphology and lexicography, a lemma (pl.: lemmas or lemmata) is the canonical form, [1] dictionary form, or citation form of a set of word forms. [2] In English, for example, break, breaks, broke, broken and breaking are forms of the same lexeme, with break as the lemma by which they are indexed.
The formal study of grammar is an important part of children's schooling from a young age through advanced learning, though the rules taught in schools are not a "grammar" in the sense that most linguists use, particularly as they are prescriptive in intent rather than descriptive.
ETF vs index fund: Here’s how they’re similar. ETFs and index funds are quite similar, and they can serve a lot of the same roles for the investor. Let’s look at what they have in common.
Composite measure in statistics and research design refer to composite measures of variables, i.e. measurements based on multiple data items. [1]An example of a composite measure is an IQ test, which gives a single score based on a series of responses to various questions.