No label defined (Q3945247)
From MaRDI portal
scientific article
| Language | Label | Description | Also known as |
|---|---|---|---|
| English | No label defined |
scientific article |
Statements
1982
0 references
identities among relations
0 references
2-dimensional homotopy theory
0 references
pre-crossed modules
0 references
Peiffer group of a pre-crossed module
0 references
free crossed module associated to a presentation of a group
0 references
relation module
0 references
module of identities of a presentation
0 references
Peiffer transformations of identity sequences
0 references
aspherical presentations
0 references
2-dimensional CW-complex associated with a group presentation
0 references
aspherical 2-complexes
0 references
asphericity of knots
0 references
Whitehead conjecture
0 references
