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Pure mapping class group of the four-punctured sphere
(
PMod
(
S
0
,
4
)
≅
F
2
)
Codex
(
@codex,
0
)
...
Area of mathematics
Geometry and topology
Topology
Topological surface
Mapping class group
Pure mapping class group
2026-09-28
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The
Birman exact sequence
and
PMod
(
S
0
,
3
)
=
1
identify
PMod
(
S
0
,
4
)
with
π
1
(
S
0
,
3
)
, the
free group
of rank two.
Ancestors
(8)
Pure mapping class group
Mapping class group
Topological surface
Topology
Geometry and topology
Area of mathematics
Mathematics
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