By V. K. Smirnov (auth.), Julius T. Tou (eds.)

Information platforms technology is advancing in numerous instructions with swift strides. Many various principles and methodologies were revised and prolonged. various new concepts and ways were con ceived and built. a few contemporary advances are lined during this sequence. The fourth quantity of this sequence presents in-depth discussions of a few newly built theories and methods bearing on machine language-level augmentation, time-sharing platforms, textual content modifying structures, grammars and automata, and mistake correcting codes in machine mathematics. In bankruptcy 1, V. okay. Smirnov offers an authoritative assessment of the augmentation of laptop language point. He discusses the results of ex pressure of computing device capabilities upon laptop language and the impression of improvement of software program structures upon the augmentation of machine language point. a few particular methods of augmenting the computing device language point are tested. the matter of data association, garage, seek, and retrieval in a working laptop or computer is studied. The creation of higher-level languages has motivated common functions of desktops. Formal language conception has been well-known as a subject offundamental value within the learn of data platforms technology. In bankruptcy 2, M. A. Harrison examines the phrase-structure grammars, the ideal linear grammars, the context-free grammars, the LR(k) grammars, and the context-sensitive grammars. the writer discusses the family members among mathematical versions of desktops and a relations of formal lan guages. The language conception could stimulate new rules for the augmentation of computing device language level.

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Vol. 22, FJCC (1962). 15. R. H. Allmark and J. R. Lucking, Design of an arithmetic unit incorporating a nesting store, in "Proc. " 16. S. Takahashi, H. Nihino, K. Yoshihiro, and K. Fuchi, System design of the ELT Mk-6 computer, in "Proc. " 17. A. J. Melbourne and J. M. Pugmire, A small computer for the direct processing of FORTRAN statements, Computer J. 8 (1) (April 1965). 18. V. M. Glushkov and Z. L. Rabinovich, Developmental trends of computer algorithm structure (in Russian), in Sb. "Kibernet.

1. will appear in register X. A more detailed description of this method of memory organization may be found in the book by Iliffe (34). This work is a good illustration of how far-reaching the consequences of changes in computer memory organization may turn out to be. It is clearly evident from the book that the striving for simplification and mechanization of the process of searching and retreiving data from the computer memory leads to essential changes in the instruction repertoire and their structure, and in the entire organization of the computer.

We now begin to formalize these notions. Sec. 2] Phrase-Structure Grammars 43 Definition. A phrase-structure grammar is a 4-tuple G = (V, E, P, S), where (i) V is a finite, nonempty set (alphabet). (ii) E s:; V is a finite, nonempty set (terminal symbols). (iii) P is a finite subset of (V - E)+ X V*, where u ---+ v is written instead of (u, v) E P (productions). (iv) S E V - E (start symbol). Example. Let G = ({a, b, A, S}, {a, b}, P, S), where P consists of the following productions: S ---+ ab S ---+ aASb A ---+ bSb AS ---+ bSb A---+A Our convention will be to use capital Roman letters for elements of V - E and lower-case letters for elements of E.