2.2.5 Show that S' is not a normal subgroup of S'.

Algebra and Trigonometry (6th Edition)
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ChapterP: Prerequisites: Fundamental Concepts Of Algebra
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of the antipodal point pairs {±q} on the 3-sphere S³. These pairs likewise have
a natural product operation, which makes RP' a group-in fact, it is the group
SO(3) of rotations of R’. We will show that RP' is not the same group as Sº,
because SO(3) is simple and S³ is not.
We can see right now that S3 is not simple, by finding a nontrivial normal
subgroup.
2.2.4 Show that {±1} is a normal subgroup of S³.
However, it turns out that {±1} is the only nontrivial normal subgroup of S'.
In particular, the subgroup S' that we found in Section 2.1 is not normal.
2.2.5 Show that S' is not a normal subgroup of S'.
2.3
The groups SU(2) and SO(3)
Transcribed Image Text:of the antipodal point pairs {±q} on the 3-sphere S³. These pairs likewise have a natural product operation, which makes RP' a group-in fact, it is the group SO(3) of rotations of R’. We will show that RP' is not the same group as Sº, because SO(3) is simple and S³ is not. We can see right now that S3 is not simple, by finding a nontrivial normal subgroup. 2.2.4 Show that {±1} is a normal subgroup of S³. However, it turns out that {±1} is the only nontrivial normal subgroup of S'. In particular, the subgroup S' that we found in Section 2.1 is not normal. 2.2.5 Show that S' is not a normal subgroup of S'. 2.3 The groups SU(2) and SO(3)
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