You have chosen 'On the Principles of Indiscernibles' by Gottfried Leibniz, 'On the General Idea of Proof Theory' by Dag Prawitz and 'Two Chief World Systems' by Galileo Galilei
start again | choose another area for these texts | all the ideas for this combination of texts| All the ideas for Thought, or select a subheading: |
| A. | Modes of Thought | |
| B. | Mechanics of Thought | |
| C. | Content | |
| D. | Concepts | |
| E. | Abstraction |