Machine Program GAL Program IntelAbstractMachineAlphaAbstractMachineDeviceDriverX11InterpreterInterpreterWindows 95 Figure 3: Multiple implementations.6 Conclusions and Future WorkDomain speci c languages hold the promise of de-livering high payo s in terms of software reuse, au-tomatic program analysis, and software engineering.In...

ion, application, a x point operator, and the let operator as in ML. We introduce a primitive type tm for terms of this functional language and introduce the constants shown with their types in Figure 3 to represent the constructs of the language. We will write and < as in x operators. Clearly not all terms of true : tm nil : tm false : tm cons : tm! tm! tm if : tm! tm! tm! tm hd : tm! tm 0 : t...

Q Should I take AI this semester? We address the problem of generating a coherent A If you want to take courses like paragraph presenting arguments for a conclusion in a Natural Language Processing or text generation system. Existing text planning techExpert Systems or Vision niques are not appropriate for this task for two main next semester, reasons: they do not explain how arguments can be i...

level. Below such a general, linguistically motivated, classi cation we have been modelling a level which we call the middle model. This level contains knowledge about physical and functional objects (e. g. electrical objects, connections etc.) and their potential states (e. g. power-supplied, tightened etc.) in the domain of technical products. Additionally, this level includes the principles ...

A d d i t i v e AND/OR graphs are de f ined as AND/ /ORgraphs w i t hou t c i r c u i t s , which can be cons idered as fo lded AND/OR t r e e s ; i . e . the cost of a common subproblem is added to the cost as many t imes as the subproblem occurs , but i t is computed on ly once. A d d i t i v e AND/OR graphs are n a t u r a l l y obta ined by r e i n t e r p r e t i n g the dy namic programmi...

ion of an InH-Prolog proof. Lost is the localness property of LJ but gained is a more directed backchaining search, where the _-LEFT rule need not be used blindly. It is instructive to note how small a change to the intuitionistic calculus LJ is needed to yield this complete proof procedure for rst-order (classical) logic. (One should note that the conversion of an arbitrary rst-order formula t...

ions and let expressions. Any such renaming is permitted so long as we avoid clashes with free variables. The nal group of structural rules in Figure 5 is closely modeled on the typing rules for OP and can be used to describe the reduction of subterms within a given term. 3.3 Equalities between terms The rules in Figure 6 de ne the equality relation for terms in OP as the transitive, symmetric ...

ion de ned by that type. With multi-methods code does not naturally belong to a particular type. Sather deals with multi-method situations by using \typecase" statements. These appear in the body of a routine which dispatches on the rst argument type and may explicitly dispatch on the second argument type. Unlike a simple \case" statement applied to the type, a \typecase" statement can branch o...

interpretation [8, 9] formalizes program analysis as approximate computation. Instead of executing a program with data, it is executed with descriptions of the data. In our case, this means that logic programs are executed with abstract substitutions instead of concrete substitutions. Concrete and abstract substitutions are related by a description relation. To every operation on the concrete s...

ion, compute a type for its body in an extended context; to compute a type for an application, compute types for its left and right components, and check that they match appropriately. Lets use the algorithm to compute a type for a = [x: ][x: ]x. FAILURE: no rule applies because x 2 Dom (x: ) x: ; x: valid x: ; x: ` x : ? x: ` [x: ]x : ! ? ` [x: ][x: ]x : ! !? (1) This system fails to derive th...