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Hatcher-Algebraic-Topology
· Problem 3F.6
Cohomology
Mathematics — Graph Theory · limits-and-ext
Problem
Show that
E
x
t
(
Z
p
∞
,
Z
p
)
≈
Z
p
\mathrm{Ext}(\mathbb{Z}_{p^\infty}, \mathbb{Z}_p) \approx \mathbb{Z}_p
Ext
(
Z
p
∞
,
Z
p
)
≈
Z
p
.
Related theory
Infinite Limits And Limits At Infinity
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