You have chosen 'The Barcan Formula and Metaphysics' by Ori Simchen, 'The Logical Syntax of Language' by Rudolph Carnap and 'Phil of Mathematics and Natural Science' by Hermann Weyl
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| A. | A Priori Knowledge | |
| B. | Perception | |
| C. | Rationalism | |
| D. | Empiricism | |
| E. | Direct Knowledge |