Combining Philosophers

All the ideas for Speussipus, Augustus De Morgan and Stephen S. Colvin

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11 ideas

1. Philosophy / E. Nature of Metaphysics / 2. Possibility of Metaphysics

20728

Metaphysics is hopeless with its present epistemology; common-sense realism is needed [Colvin]

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 / 2. Domain of Quantification

17743

De Morgan introduced a 'universe of discourse', to replace Boole's universe of 'all things' [De Morgan, by Walicki]

7. Existence / D. Theories of Reality / 2. Realism

20726

We can only distinguish self from non-self if there is an inflexible external reality [Colvin]

20727

Common-sense realism rests on our interests and practical life [Colvin]

7. Existence / D. Theories of Reality / 4. Anti-realism

20729

Arguments that objects are unknowable or non-existent assume the knower's existence [Colvin]

20730

If objects are doubted because their appearances change, that presupposes one object [Colvin]

20731

The idea that everything is relations is contradictory; relations are part of the concept of things [Colvin]

9. Objects / B. Unity of Objects / 2. Substance / c. Types of substance

594	Speusippus suggested underlying principles for every substance, and ended with a huge list [Speussipus, by Aristotle]

28. God / C. Attitudes to God / 5. Atheism

2632	Speusippus said things were governed by some animal force rather than the gods [Speussipus, by Cicero]