How we Reason
This chapter explains the heart of a human's reasoning. Mental models of possibilities are at the heart of this reasoning. The theory confronts two challenges that pull in opposite directions. It must account for the nature of the errors that are made in reasoning; and it must explain the potential for rationality. At the heart of human rationality are some simple principles that are recognized: a conclusion must be the case if it holds in all the possibilities compatible with the premises. The models that have been argued for here underlie deduction, induction, and abduction. The argument of this book is that reasoning depends on mental models, and that a conclusion can be comprehended which follows from premises if it holds for every model of the premises.
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