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A candidate key (or minimal superkey) is a superkey that can't be reduced to a simpler superkey by removing an attribute. [ 3 ] For example, in an employee schema with attributes employeeID , name , job , and departmentID , if employeeID values are unique then employeeID combined with any or all of the other attributes can uniquely identify ...
By hypothesis, I-language—also called universal grammar—corresponds to the initial state of the human language faculty in individual human development. Minimalism is reductive in that it aims to identify which aspects of human language—as well the computational system that underlies it—are conceptually necessary.
The entropy rule presumably allows the ordered sequents to be broken up into unordered sequents. And finally, the last rule implements "movement" by means of assumption elimination. The last rule can be given a number of different interpretations in order to fully mimic movement of the normal sort found in the Minimalist Program.
Generalized phrase structure grammar; Head-driven phrase structure grammar; Lexical functional grammar; The minimalist program; Nanosyntax; Further grammar frameworks and formalisms also qualify as constituency-based, although they may not think of themselves as having spawned from Chomsky's work, e.g. Arc pair grammar, and; Categorial grammar.
The rule is allowed if does not appear on the right side of any rule. The languages described by these grammars are exactly all languages that can be recognized by a linear bounded automaton (a nondeterministic Turing machine whose tape is bounded by a constant times the length of the input.)
Separating phrase structure grammar (PSG) from the lexicon simplifies PS rules to being a context-free rule (B → D) as opposed to being context sensitive (ABC → ADC). [ 17 ] Context-sensitive phrase-structure (PS) rules A B C → A D C B = single symbol A, C, D = string of symbols (D = non-null, A and C can be null) A and C are non-null ...
A candidate key is a minimal superkey, [1] i.e., a superkey that does not contain a smaller one. Therefore, a relation can have multiple candidate keys, each with a different number of attributes. [2] Specific candidate keys are sometimes called primary keys, secondary keys or alternate keys.
Government and binding (GB, GBT) is a theory of syntax and a phrase structure grammar in the tradition of transformational grammar developed principally by Noam Chomsky in the 1980s. [ 1 ] [ 2 ] [ 3 ] This theory is a radical revision of his earlier theories [ 4 ] [ 5 ] [ 6 ] and was later revised in The Minimalist Program (1995) [ 7 ] and ...