| P1343 | described by source | ... | Q124737616 (Armenian Soviet Encyclopedia, vol. 3) | Armenian Soviet Encyclopedia, vol. 3 |
| P1889 | different from | ... | Q453341 (Klass) | Klass |
| P1889 | different from | ... | Q1744556 (Klasse) | Klasse |
| P1889 | different from | ... | Q3679160 (Class) | Class |
| P1889 | different from | ... | Q8346739 (Clase) | Clase |
| P1889 | different from | ... | Q13085175 (Klasa) | Klasa |
| P1889 | different from | ... | Q16889133 (class) | class |
| P2738 | disjoint union of | ... | Q23766486 (list of values as qualifiers) | list of values as qualifiers |
| P156 | followed by | ... | Q719395 (category) | category |
| P6104 | maintained by WikiProject | ... | Q8487137 (WikiProject Mathematics) | WikiProject Mathematics |
| P5869 | model item | ... | Q1327762 (elementary class) | elementary class |
| P5869 | model item | ... | Q115489271 (proper class) | proper class |
| P2579 | studied by | ... | Q12482 (set theory) | set theory |
| P279 | subclass of | ... | Q246672 (mathematical object) | mathematical object |
| P279 | subclass of | ... | Q748349 (mathematical structure) | mathematical structure |
| P2581 | BabelNet ID | 01341184n |
| P2581 | BabelNet ID | 01341184n |
| P7554 | Encyclopedia of Mathematics article ID | Class |
| P1417 | Encyclopædia Britannica Online ID | science/class-mathematics |
| P6262 | Fandom article ID | googology:Class_(set_theory) |
| P646 | Freebase ID | /m/056cc |
| P8408 | KBpedia ID | SetOrCollection |
| P2812 | MathWorld ID | SetClass |
| P6366 | Microsoft Academic ID (discontinued) | 142805521 |
| P4215 | nLab ID | class |
| P7726 | PlanetMath ID | Class |
| P6781 | ProofWiki ID | Definition:Class_(Class_Theory) |
| P1051 | PSH ID | 7148 |
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