| P31 | instance of | ... | Q20026918 (mathematical theory) | mathematical theory |
| P2578 | is the study of | ... | Q7241077 (presheaf) | presheaf |
| P361 | part of | ... | Q114703792 (theory of functors) | theory of functors |
| P361 | part of | ... | Q114716129 (topological space theory) | topological space theory |
| P910 | topic's main category | ... | Q114706530 (???) | ??? |
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