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All the ideas for 'fragments/reports', 'The Realm of Matter' and 'Logic [1897]'
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3 ideas
7. Existence / A. Nature of Existence / 6. Criterion for Existence
18521
The criterion of existence is the possibility of action
[Santayana]
13. Knowledge Criteria / C. External Justification / 2. Causal Justification
11052
Psychological logic can't distinguish justification from causes of a belief
[Frege]
21. Aesthetics / C. Artistic Issues / 7. Art and Morality
468
Musical performance can reveal a range of virtues
[Damon of Ath.]