Combining Texts

All the ideas for 'works', 'On the Syllogism IV' and 'Title, Unity, Authenticity of the 'Categories''

expand these ideas     |    start again     |     specify just one area for these texts

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4 ideas

1. Philosophy / C. History of Philosophy / 3. Earlier European Philosophy / b. Early medieval philosophy

16137

Earlier views of Aristotle were dominated by 'Categories' [Frede,M]

5. Theory of Logic / E. Structures of Logic / 6. Relations in Logic

17744

De Morgan started the study of relations and their properties [De Morgan, by Walicki]

13501

De Morgan found inferences involving relations, which eluded Aristotle's syllogistic [De Morgan, by Hart,WD]

5. Theory of Logic / G. Quantification / 4. Substitutional Quantification

10800

The values of variables can't determine existence, because they are just expressions [Ryle, by Quine]