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
|