A Derivation A = > Derivation Tree Derivation A = > Derivation Tree
نویسنده
چکیده
The basic Schema Theorem for genetic algorithms is modiied for a grammatically-based learning system. A context-free grammar is used to deene a language in which each sentence is mapped to a tness value. The derivation trees associated with these sentences are used to deene the structure of schemata. The eeect of crossover and mutation on schemata is described. A schema theorem is developed which describes how sentences of a language are propagated during evolution.
منابع مشابه
On Jordan left derivations and generalized Jordan left derivations of matrix rings
Abstract. Let R be a 2-torsion free ring with identity. In this paper, first we prove that any Jordan left derivation (hence, any left derivation) on the full matrix ringMn(R) (n 2) is identically zero, and any generalized left derivation on this ring is a right centralizer. Next, we show that if R is also a prime ring and n 1, then any Jordan left derivation on the ring Tn(R) of all n×n uppe...
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A derivation tree consists of nodes containing sets of assertions. The root node contains an initial set of assertions and each non-leaf node is labeled by a derivation rule used to derive the children of the node from the node itself. The derivation rules used by the T S solver give rise to a sequence of derivation trees (called a derivation). The initial tree in the derivation contains only a...
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