| P31 | instance of | ... | Q24034552 (mathematical concept) | mathematical concept |
| P138 | named after | ... | Q3385916 (Pierre Emile Lelong) | Pierre Emile Lelong |
| P279 | subclass of | ... | Q188211 (invariant) | invariant |
| P646 | Freebase ID | /m/0nfwvfz |
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