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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 statistics and research design, an index is a composite statistic – a measure of changes in a representative group of individual data points, or in other words, a compound measure that aggregates multiple indicators. [1] [2] Indices – also known as indexes and composite indicators – summarize and rank specific observations. [2]
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.
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.
The first page of the index of Novus Atlas Sinensis by Martino Martini, an altas of China published in 1655 . An index (pl.: usually indexes, more rarely indices) is a list of words or phrases ('headings') and associated pointers ('locators') to where useful material relating to that heading can be found in a document or collection of documents.