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The Quest for Artificial Intelligence by Nils J. Nilsson

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Intelligent System Architectures

COMPUTER SCIENTISTS HAVE DEVELOPED VARIOUS WAYS TO PUT TOGETHER LARGE programs consisting of many specialist subprograms. The traditional framework that controls the running of most programs involves having a main program that runs through its instructions step by step, retrieving from and storing data in memory, executing various operations on such data, and taking other allowed actions. Some of the instructions in the main program might be to “call” a subprogram, handing control over to it. The subprograms, in turn, can call other subprograms, and so on. After a subprogram finishes doing what it has been called to do, overall control returns to the program that called it, which might then call another subprogram, ...

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