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  2. List of undecidable problems - Wikipedia

    en.wikipedia.org/wiki/List_of_undecidable_problems

    Determining if a context-free grammar generates all possible strings, or if it is ambiguous. Given two context-free grammars, determining whether they generate the same set of strings, or whether one generates a subset of the strings generated by the other, or whether there is any string at all that both generate.

  3. Smallest grammar problem - Wikipedia

    en.wikipedia.org/wiki/Smallest_grammar_problem

    The (decision version of the) smallest grammar problem is NP-complete. [1] It can be approximated in polynomial time to within a logarithmic approximation ratio ; more precisely, the ratio is O ( log ⁡ n g ) {\displaystyle O(\log {\tfrac {n}{g}})} where n {\displaystyle n} is the length of the given string and g {\displaystyle g} is the size ...

  4. Common English usage misconceptions - Wikipedia

    en.wikipedia.org/wiki/Common_English_usage...

    This can create problems, as described by Reginald Close: Teachers and textbook writers often invent rules which their students and readers repeat and perpetuate. These rules are usually statements about English usage which the authors imagine to be, as a rule, true. But statements of this kind are extremely difficult to formulate both simply ...

  5. English grammar - Wikipedia

    en.wikipedia.org/wiki/English_grammar

    Professor Whitney in his Essentials of English Grammar recommends the German original stating "there is an English version, but it is hardly to be used." (p. vi) Meyer-Myklestad, J. (1967). An Advanced English Grammar for Students and Teachers. Universitetsforlaget-Oslo. p. 627. Morenberg, Max (2002). Doing Grammar, 3rd edition. New York ...

  6. List of English words with disputed usage - Wikipedia

    en.wikipedia.org/wiki/List_of_English_words_with...

    A aggravate – Some have argued that this word should not be used in the sense of "to annoy" or "to oppress", but only to mean "to make worse". According to AHDI, the use of "aggravate" as "annoy" occurs in English as far back as the 17th century. In Latin, from which the word was borrowed, both meanings were used. Sixty-eight percent of AHD4's usage panel approves of its use in "It's the ...

  7. Tough movement - Wikipedia

    en.wikipedia.org/wiki/Tough_movement

    In (1) and (2), the (a) examples illustrate tough movement in English. In (1a) this problem is logically the object of solve, and (1a) can be paraphrased as (1b) or (1c). In (2a) Chris is logically the object of please, and (2a) can be paraphrased as (2b) or (2c). (1) a. This problem is tough to solve. b. It is tough to solve this

  8. The Cambridge Grammar of the English Language - Wikipedia

    en.wikipedia.org/wiki/The_Cambridge_Grammar_of...

    The Cambridge Grammar of the English Language (CamGEL [n 1]) is a descriptive grammar of the English language. Its primary authors are Rodney Huddleston and Geoffrey K. Pullum. Huddleston was the only author to work on every chapter. It was published by Cambridge University Press in 2002 and has been cited more than 8,000 times. [1]

  9. Wren & Martin - Wikipedia

    en.wikipedia.org/wiki/Wren_&_Martin

    The content in the books is largely based on The Manual of English Grammar and Composition by J. C. Nesfield. Other books in this series are Elementary English Grammar, A First Book of English Grammar and Composition, High School English Grammar and Composition and A Final Course of Grammar & Composition. The series of textbooks is still in use ...

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