Combining Texts
Ideas for
'Lectures 1930-32 (student notes)', 'Ontological Relativity' and 'Introduction to Mathematical Philosophy'
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17 ideas
5. Theory of Logic / A. Overview of Logic / 1. Overview of Logic
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18724
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In logic nothing is hidden [Wittgenstein]
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5. Theory of Logic / A. Overview of Logic / 4. Pure Logic
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14452
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All the propositions of logic are completely general [Russell]
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5. Theory of Logic / A. Overview of Logic / 8. Logic of Mathematics
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14462
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In modern times, logic has become mathematical, and mathematics has become logical [Russell]
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5. Theory of Logic / C. Ontology of Logic / 1. Ontology of Logic
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10057
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Logic can only assert hypothetical existence [Russell]
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12444
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Logic is concerned with the real world just as truly as zoology [Russell]
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14464
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Logic can be known a priori, without study of the actual world [Russell]
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5. Theory of Logic / C. Ontology of Logic / 4. Logic by Convention
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18709
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Laws of logic are like laws of chess - if you change them, it's just a different game [Wittgenstein]
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5. Theory of Logic / D. Assumptions for Logic / 3. Contradiction
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18736
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Contradiction is between two rules, not between rule and reality [Wittgenstein]
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5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / c. not
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18723
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We may correctly use 'not' without making the rule explicit [Wittgenstein]
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5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / d. and
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18718
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Saying 'and' has meaning is just saying it works in a sentence [Wittgenstein]
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5. Theory of Logic / F. Referring in Logic / 1. Naming / a. Names
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18727
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A person's name doesn't mean their body; bodies don't sit down, and their existence can be denied [Wittgenstein]
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5. Theory of Logic / F. Referring in Logic / 1. Naming / b. Names as descriptive
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14458
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Asking 'Did Homer exist?' is employing an abbreviated description [Russell]
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10450
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Russell admitted that even names could also be used as descriptions [Russell, by Bach]
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14457
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Names are really descriptions, except for a few words like 'this' and 'that' [Russell]
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5. Theory of Logic / F. Referring in Logic / 1. Naming / f. Names eliminated
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7311
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The only genuine proper names are 'this' and 'that' [Russell]
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5. Theory of Logic / F. Referring in Logic / 2. Descriptions / a. Descriptions
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14455
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'I met a unicorn' is meaningful, and so is 'unicorn', but 'a unicorn' is not [Russell]
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5. Theory of Logic / G. Quantification / 4. Substitutional Quantification
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21642
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If quantification is all substitutional, there is no ontology [Quine]
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