Wikidata entity: Q409392
| P31 | instance of | ... | Q976981 (formula) | formula |
| P138 | named after | ... | Q20018 (George Biddell Airy) | George Biddell Airy |
| P361 | part of | ... | Q14620 (optics) | optics |
| P361 | part of | ... | Q377930 (classical electromagnetism) | classical electromagnetism |
| P2671 | Google Knowledge Graph ID | /g/12271s9d |
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