منابع مشابه
Hierarchies of Hyper-AFLs
For a full semi-AFL K, B(K) is defined as the family of languages generated by all K-extended basic macro grammars, while H(K) 5 B(K) is the smallest full hyper-AFL containing K, a full basic-AFL is a full AFL K such that B(K) = K (hence every full basic-AFL is a full hyper-AFL). For any full semi-AFL K, K is a full basic-AFL if and only if B(K) is substitution closed if and only if H(K) is a f...
متن کاملOn the effect of the IO-substitution on the Parikh image of semilinear AFLs
Back in the 80’s, the class of mildly context-sensitive formalisms was introduced so as to capture the syntax of natural languages. While the languages generated by such formalisms are constrained by the constant-growth property, the most well-known and used mildly context-sensitive formalisms like tree-adjoining grammars or multiple context-free grammars generate languages which verify the str...
متن کاملSuccessive Difference Substitution Based on Column Stochastic Matrix and Mechanical Decision for Positive Semi-definite Forms
Employing the concept of termination of sequence of SDS sets to describe the positive semidefinite property of a form, we establish a necessary and sufficient condition for deciding whether a given form on Rn+ is positive semi-definite or not, and show that, for a form which is (strictly) positive definite on Rn+, the corresponding sequence of SDS sets is positively terminating. The above resul...
متن کاملEstimate of Armington substitution elasticity for fishery products in Iran
Abstract Nowadays, fishery and aquaculture products form an important fraction of the protein requirement and food of many people on the earth. The hike in prices of these essential products seems necessary owing to the increase in demand and consumption of these products in the country. The price transmission from the international market to the domestic market of tunas was investigated in t...
متن کاملEstimate of Armington substitution elasticity for fishery products in Iran
The price transmission from the international market to the domestic market of tunas was investigated in the present research. For this purpose, the elasticity of substitution between tuna imports with goods produced in Iran (Armington Elasticity) was calculated. Armington elasticity reflects a degree of substitution between commodities produced domestically and those produced abroad. A greater...
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ژورنال
عنوان ژورنال: Theoretical Computer Science
سال: 1981
ISSN: 0304-3975
DOI: 10.1016/0304-3975(81)90056-6