| P31 | instance of | ... | Q65943 (theorem) | theorem |
| P6104 | maintained by WikiProject | ... | Q8487137 (WikiProject Mathematics) | WikiProject Mathematics |
| P138 | named after | ... | Q7606043 (Stefan Burr) | Stefan Burr |
| P138 | named after | ... | Q173746 (Paul Erdős) | Paul Erdős |
| P646 | Freebase ID | /m/08qfr2 |
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