Persian mathematician called Abu Nasr al-Farabi. He was the first Muslim to develop a non-Aristotelian logic. Al-Farabi discussed contingencies, and the relation between logic and grammar. He is also credited with categorizing logic into the idea and the proof.
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Currency
Stamp | Description |
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Turkey, 15k, 1950 Scott: 1037 A199 |
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Turkey, 20k, 1950 Scott: 1038 A199 |
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Turkey, 60k, 1950 Scott: 1039 A199 |
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Turkey, 1l, 1950 Scott: 1040 A199 |
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Egypt, 20m, 1975 Scott: 997 A458 |
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Russia, 6k, 1975 Scott: 4350 A2067 |