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Chapter 9
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World in a mirror
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Symmetries simplify the dynamics in a beautiful way:
If dynamics is invariant under a set of
discrete symmetries, it can be reduced to dynamics
within the fundamental domain.
Families of symmetry-related cycles
are replaced by fewer and often much shorter
"relative" cycles.
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Chapter 10
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Relativity for cyclists
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If the symmetry is continuous, the dynamics is reduced to a
lower-dimensional desymmetrized system by symmetry reduction.
We describe how to do this by `slicing' the group orbits.
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