Quantities
| P6438 | Euler characteristic | 0 |
| P31 | instance of | ... | Q24034552 (mathematical concept) | mathematical concept |
| P138 | named after | ... | Q78448 (Heinz Hopf) | Heinz Hopf |
| P279 | subclass of | ... | Q2566544 (4-manifold) | 4-manifold |
| P279 | subclass of | ... | Q21281369 (complex surface) | complex surface |
| P646 | Freebase ID | /m/0642xwr |
| P6366 | Microsoft Academic ID (discontinued) | 2780215791 |
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