Combining Texts
Ideas for
'The Evolution of Modern Metaphysics', 'Language,Truth and Logic' and 'On Perceptions'
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12 ideas
12. Knowledge Sources / A. A Priori Knowledge / 4. A Priori as Necessities
5198
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We could verify 'a thing can't be in two places at once' by destroying one of the things [Ierubino on Ayer]
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12. Knowledge Sources / A. A Priori Knowledge / 5. A Priori Synthetic
2619
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Whether geometry can be applied to reality is an empirical question outside of geometry [Ayer]
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12. Knowledge Sources / A. A Priori Knowledge / 7. A Priori from Convention
5197
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By changing definitions we could make 'a thing can't be in two places at once' a contradiction [Ayer]
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12. Knowledge Sources / A. A Priori Knowledge / 8. A Priori as Analytic
5204
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To say that a proposition is true a priori is to say that it is a tautology [Ayer]
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12. Knowledge Sources / B. Perception / 4. Sense Data / a. Sense-data theory
6524
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Positivists prefer sense-data to objects, because the vocabulary covers both illusions and perceptions [Ayer, by Robinson,H]
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12. Knowledge Sources / B. Perception / 7. Causal Perception
5193
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Causal and representative theories of perception are wrong as they refer to unobservables [Ayer]
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12. Knowledge Sources / C. Rationalism / 1. Rationalism
5200
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The main claim of rationalism is that thought is an independent source of knowledge [Ayer]
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12. Knowledge Sources / D. Empiricism / 1. Empiricism
4729
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Empiricism lacked a decent account of the a priori, until Ayer said it was entirely analytic [O'Grady on Ayer]
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5180
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All propositions (especially 'metaphysics') must begin with the senses [Ayer]
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5169
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My empiricism logically distinguishes analytic and synthetic propositions, and metaphysical verbiage [Ayer]
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12. Knowledge Sources / D. Empiricism / 4. Pro-Empiricism
5185
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It is further sense-experience which informs us of the mistakes that arise out of sense-experience [Ayer]
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12. Knowledge Sources / D. Empiricism / 5. Empiricism Critique
5199
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Empiricism, it is said, cannot account for our knowledge of necessary truths [Ayer]
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