Can computer reason? Reasoning requires the individual to take a given set of facts and draw correct conclusions. Unfortunately, errors frequently occur. Now, or at least soon, computers will be able to do logical reasoning in a variety of areas without making errors. The key to avoiding errors is to use a computer program that relies on the recent research in this field. AURA (Automated Reasoning Assistant) is the program that is the best example of this use of the computer.

　　AURA solves a program by drawing conclusions from a given set of facts about the problem. The program reaches logical conclusions perfectly as it uses various types of reasoning and solves almost all problems by using advanced techniques to find a contradiction(矛盾)．

　　One generally starts with a set of assumptions and adds a statement that the goal is unreachable. For example, if the problem is to test safety system that automatically(自动地)

　　shuts down a nuclear reactor when instruments indicate a problem, AURA is told that the system will not shut the reactor down under those circumstances. If AURA finds a contradiction between the statement and the system's design

　　assumptions, then this aspect of the reactor's design has been proved satisfactory.

　　This strategy lets AURA concentrate on the problem at hand and avoid many fruitless steps.

　　The chief use for AURA at this time is for electronic circuit(电路) design check, but a number of other uses will arise. For example, there already exist “expert systems” that are special purpose programs designed to automate reasoning in a specific area such as medical diagnosis. These expert systems continue to improve and have an endless life.

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