3
02 - Logic as the Essence of Philosophy
4
03 - On Our Knowledge of the External World
5
04 - The World of Physics and the World of Sense
6
05 - The Theory of Continuity
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06 - The Problem of Infinity Considered Historically
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07 - The Positive Theory of Infinity
9
08 - On the Notion of Cause, with Applications to the Free-Will Problem