You have chosen 'Abstract of 'The Fourfold Root'' by Arthur Schopenhauer, 'Grundlagen der Arithmetik (Foundations)' by Gottlob Frege and 'The Universe as We Find It' by John Heil
start again | choose another area for these texts | all the ideas for this combination of texts| All the ideas for Knowledge Sources, or select a subheading: |
| A. | A Priori Knowledge | |
| B. | Perception | |
| C. | Rationalism | |
| D. | Empiricism | |
| E. | Direct Knowledge |