| P373 | Commons category | String | Petr–Douglas–Neumann theorem | ??? |
| P61 | discoverer or inventor | ... | Q72078 (Bernhard Neumann) | Bernhard Neumann |
| P61 | discoverer or inventor | ... | Q315404 (Jesse Douglas) | Jesse Douglas |
| P61 | discoverer or inventor | ... | Q6369357 (Karel Petr) | Karel Petr |
| P31 | instance of | ... | Q65943 (theorem) | theorem |
| P6104 | maintained by WikiProject | ... | Q8487137 (WikiProject Mathematics) | WikiProject Mathematics |
| P138 | named after | ... | Q72078 (Bernhard Neumann) | Bernhard Neumann |
| P138 | named after | ... | Q315404 (Jesse Douglas) | Jesse Douglas |
| P138 | named after | ... | Q6369357 (Karel Petr) | Karel Petr |
| P2384 | statement describes | ... | Q37555 (polygon) | polygon |
| P646 | Freebase ID | /m/0jt43h6 |
| P6366 | Microsoft Academic ID (discontinued) | 2776059679 |
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