You have chosen 'Presidential Address of Am. Math. Soc' by Oswald Veblen, 'The Concept of Logical Consequence' by Alfred Tarski and 'Introduction to 'Language Truth and Logic'' by A.J. Ayer
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| A. | Justification Problems | |
| B. | Internal Justification | |
| C. | External Justification | |
| D. | Scepticism | |
| E. | Relativism |