Statements (14)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
gptkb:topology
|
| gptkbp:dimensions |
2
|
| gptkbp:firstDescribed |
1930s
|
| gptkbp:fundamentalGroup |
Prüfer group
|
| gptkbp:heldBy |
gptkb:Hausdorff
compact non-orientable surface connected not metrizable |
| https://www.w3.org/2000/01/rdf-schema#label |
Pontryagin surface
|
| gptkbp:namedAfter |
gptkb:Lev_Pontryagin
|
| gptkbp:studiedIn |
gptkb:topology
|
| gptkbp:bfsParent |
gptkb:Soviet_school_of_topology
|
| gptkbp:bfsLayer |
8
|