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Quotient Space Based Problem Solving by Bo Zhang, Ling Zhang

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4.6. Qualitative Reasoning

An exactly quantitative description of the world being analyzed is not always available. For example, in the early stage of engineering design of a device, one may not know the exact value of all parameters of the device. In this case the incomplete knowledge can be used by representing the device in a qualitative form. By using the qualitative description we can get a better understanding of the device at the desired level. A reasoning based on the qualitative description of the world is called qualitative reasoning. The device’s behaviors can be predicted and the decisions can be made using the reasoning. Therefore, qualitative reasoning is to provide a broad picture of the functioning of the world by taking a step ...

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