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ampliative reasoning

Subject Philosophy

DOI: 10.1111/b.9781405106795.2004.x


L ogic [from Latin ampliatio , broadening; in contrast to restrictio , narrowing] In medieval logic, the broadening of a term's extension. For Peirce , ampliation is ampliative reasoning in which the conclusion goes beyond what is contained in the premises. For example, we infer from “some x are y” to “all x are y.” Ampliative induction, in contrast to other forms of induction, reasons in this way. In contrast, the conclusion of deductive reasoning is generally thought to be already contained in the premises. For Kant , a synthetic judgment is an ampliative judgment, because its predicate adds something new to its subject, in contrast to analytic or clarificatory judgments, in which the predicate can be derived through analysis of the subject term. “In ampliative reasoning the ratio may be wrong, because the inference is based on but a limited number of instances; but on enlarging the same the ratio will be changed till it becomes approximately correct.” Peirce, Collected Papers , vol. II ... log in or subscribe to read full text

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