| P31 | instance of | ... | Q1166625 (mathematical problem) | mathematical problem |
| P31 | instance of | ... | Q24034552 (mathematical concept) | mathematical concept |
| P138 | named after | ... | Q173746 (Paul Erdős) | Paul Erdős |
| P138 | named after | ... | Q234357 (Stanisław Ulam) | Stanisław Ulam |
| P2671 | Google Knowledge Graph ID | /g/11c5wkpdxk |
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