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  2. Levels of adequacy - Wikipedia

    en.wikipedia.org/wiki/Levels_of_adequacy

    The theory achieves an exhaustive and discrete enumeration of the data points. There is a pigeonhole for each observation. Descriptive adequacy. The theory formally specifies rules accounting for all observed arrangements of the data. The rules produce all and only the well-formed constructs (relations) of the protocol space.

  3. Well-formedness - Wikipedia

    en.wikipedia.org/wiki/Well-formedness

    Gradient well-formedness is a problem that arises in the analysis of data in generative linguistics, in which a linguistic entity is neither completely grammatical nor completely ungrammatical. A native speaker may judge a word, phrase or pronunciation as "not quite right" or "almost there," rather than dismissing it as completely unacceptable ...

  4. Van Wijngaarden grammar - Wikipedia

    en.wikipedia.org/wiki/Van_Wijngaarden_grammar

    W-grammars are two-level grammars: they are defined by a pair of grammars, that operate on different levels: the hypergrammar is an attribute grammar, i.e. a set of context-free grammar rules in which the nonterminals may have attributes; and; the metagrammar is a context-free grammar defining possible values for these attributes.

  5. Formal language - Wikipedia

    en.wikipedia.org/wiki/Formal_language

    The deductive apparatus may consist of a set of transformation rules, which may be interpreted as valid rules of inference, or a set of axioms, or have both. A formal system is used to derive one expression from one or more other expressions. Although a formal language can be identified with its formulas, a formal system cannot be likewise ...

  6. Syntax (programming languages) - Wikipedia

    en.wikipedia.org/wiki/Syntax_(programming_languages)

    The phrase grammar of most programming languages can be specified using a Type-2 grammar, i.e., they are context-free grammars, [8] though the overall syntax is context-sensitive (due to variable declarations and nested scopes), hence Type-1. However, there are exceptions, and for some languages the phrase grammar is Type-0 (Turing-complete).

  7. Chomsky hierarchy - Wikipedia

    en.wikipedia.org/wiki/Chomsky_hierarchy

    Set inclusions described by the Chomsky hierarchy. 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.

  8. 5 common investing myths — debunked: Why you don't need ...

    www.aol.com/finance/investing-myths-181038304.html

    Here's what different recurring investment amounts can get you: $1 to $5. Fractional shares of stocks or ETFs. $50 to $500. A diverse portfolio of fractional shares across multiple stocks and ETFs.

  9. Grammaticality - Wikipedia

    en.wikipedia.org/wiki/Grammaticality

    According to Chomsky, a speaker's grammaticality judgement is based on two factors: . A native speaker's linguistic competence, which is the knowledge that they have of their language, allows them to easily judge whether a sentence is grammatical or ungrammatical based on intuitive introspection.