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Hatcher-Algebraic-Topology
· Problem 2.2.4
Homology
Mathematics — Graph Theory · degree-theory
Problem
Construct a surjective map
S
n
→
S
n
S^n \to S^n
S
n
→
S
n
of degree zero, for each
n
≥
1
n \geq 1
n
≥
1
.
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