You have chosen 'On Multiplying Entities' by Willard Quine, 'A Mathematical Introduction to Logic (2nd)' by Herbert B. Enderton and 'The Concept of Logical Consequence' by Alfred Tarski
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| A. | Justification Problems | |
| B. | Internal Justification | |
| C. | External Justification | |
| D. | Scepticism | |
| E. | Relativism |