Prove that \[ S^1\vee S^1 \] is not a retract of \[ S^1\times S^1. \]
The figure-eight is not a retract of the torus
P-QUAL-REVIEW-HATCHER-13
- Area
- Topology
- Status
- draft
P-QUAL-REVIEW-HATCHER-13
Prove that \[ S^1\vee S^1 \] is not a retract of \[ S^1\times S^1. \]