| P31 | instance of | ... | Q24034552 (mathematical concept) | mathematical concept |
| P138 | named after | ... | Q106622 (Hans Petersson) | Hans Petersson |
| P646 | Freebase ID | /m/0bdbc1 |
| P6366 | Microsoft Academic ID (discontinued) | 2779065565 |
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log id: 7215528