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power (n.)
المؤلف:
David Crystal
المصدر:
A dictionary of linguistics and phonetics
الجزء والصفحة:
378-16
2023-10-31
1129
+
-
20
power (n.)
A term used in the formal evaluation of GRAMMARS, and particularly found in discussion of GENERATIVE theories; also called capacity. Basically, grammar A would be said to be more powerful than grammar B if it can generate more LANGUAGES (SENTENCES, etc.) than B. In this sense, a CONTEXT-free grammar is more powerful than a FINITE-STATE GRAMMAR. It is important, however, that a grammar should not become too powerful, in the sense that it generates sentences which are ungrammatical, structural descriptions which are intuitively implausible, or a characterization of natural language that is too broad (e.g. including features of non-language systems). FORMAL constraints therefore have to be built into grammatical MODELS to restrict the power of grammars in specific ways, and much current discussion is focused on this subject. A further distinction is often introduced, between weak and strong generative power within a grammar. In the notion of ‘weak’ generative power, a grammar (or RULE, or set of rules, etc.) is said to be more powerful than another if it GENERATES more grammatical sentences. In the notion of ‘strong’ generative power, a grammar is said to be more powerful if it assigns to these sentences a set of STRUCTURAL DESCRIPTIONS which more satisfactorily shows their relationships.
الاكثر قراءة في Syntax
اخر الاخبار
اخبار العتبة العباسية المقدسة
الآخبار الصحية
مواضيع ذات صلة
(نوافذ).. إصدار أدبي يوثق القصص الفائزة في مسابقة الإمام العسكري (عليه السلام)
قسم الشؤون الفكرية يصدر مجموعة قصصية بعنوان (قلوب بلا مأوى)
قسم الشؤون الفكرية يصدر مجموعة قصصية بعنوان (قلوب بلا مأوى)
