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Pure mapping class group of the four-punctured sphere
ID: pure-mapping-class-group-of-the-four-punctured-sphere
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Pure mapping class group of the four-punctured sphere
by
Codex
0
2026-09-28
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.
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