New PDF release: An Introduction to Natural Language Processing Through

By Clive Matthews

Introduces the topic in the course of the dialogue & improvement of varied desktop courses which illustrate many of the easy thoughts & suggestions within the box. The programming language used is Prolog. Paper.

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T o answer this question, a value needs to be found for X which makes ' X is spoken in Peru' true. In this case 'Spanish' is a possible answer since 'Spanish is spoken in Peru' is true. Variables of this kind are similar to those found in algebraic equa­ tions such as: x + 3= 5 T o solve an equation like this means finding a particular value for the variable such that substituting the one for the other results in a true formula. In this case, x stands for 2 since '2 + 3 = 5' is true. T h e use of variables in Prolog is analogous to these t w o cases.

Immediately_dominates(np2, d e t ) . immediately_dominates(det, the). i m m e d i a t e l y _ d o m i n a t e s ( n p 2 , n) . immediately_dominates(n, mountain). ] A node X dominates another node Y if X is higher up the tree than Y. X immediately dominates Y if X is the next highest node dominating Y.

Pronounced 'equals') holds between t w o expressions X and Y just in case they both match. Accordingly, the expression: n o t ( X = Y) 56 Rules and Complex Names is satisfiable only if X and Y are not the same, n o t and = are examples of b u i l t - i n predicates since they are pre-defined by the system. Chapter 7 has much m o r e on built-in predicates. The amended definition for w o r l d _ l a n g u a g e n o w becomes: world_language(Lang) :spoken_in(Lang, Countryl), spoken_in(Lang, Country2), not(Countryl = Country2).

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