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By John Stuart Mill

ISBN-10: 0802018750

ISBN-13: 9780802018755

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Extra resources for A System of Logic Ratiocinative and Inductive, Part I (The Collected Works of John Stuart Mill - Volume 07)

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Mill has said that to understand the nature of proof it is necessary to understand the nature of propositions, for it is these which are proved. But, in turn, to understand the nature of propositions, or the meaning of what is asserted, it is necessary to consider the nature of the meanings of names, for in every proposition one name is asserted of another name, the predicate of the proposition being the name which denotes what is affirmed or denied, and the subject being the name which denotes the person or thing of which something is affirmed or denied.

The legislator'sproblem, on the other hand, is to find rules. This depends on determining the best means of achieving certain desired ends. It is science alone which can determine these means, for the relation between means and ends is the relation between causes and effects. INTRODUCTION XIv In this second kind of practical reasoning, art prescribes the end, science provides the theorem which shows how it is to be brought about, and art then converts the theorem into a rule. In this way propositions which assert only what ought to be, or should be done, are grounded on propositions which assert only matters of fact.

INTRODUC_ON xli ference, and of such other mental operations as are intended to facilitate this. " (12). In turning to the subject of inference in Book II, Mill says, "The proper subject, however, of Logic is Proof" (157)• To understand what proof is, it is necessary first to understand the nature of what is proved, namely, propositions, for it is propositions which are believed or disbelieved, affirmed or denied, as true or false. In inquiring into the nature of propositions we must, says Mill, distinguish, as all language recognizes, between "the state of mind called Belief" and "what is believed"; between "an opinion" and "the fact of entertaining the opinion"; between "assent" and "what is assented to": Logic...

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A System of Logic Ratiocinative and Inductive, Part I (The Collected Works of John Stuart Mill - Volume 07) by John Stuart Mill


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