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- -- card: 7747 from stack: in
- -- bmap block id: 9124
- -- flags: 0000
- -- background id: 2586
- -- name:
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- -- part contents for background part 23
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- If a trajectory joins up to itself to form a closed loop then it is called a limit cycle , closed orbit ,
- periodic trajectory , or oscillation .
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- They may be stable or unstable.
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- Their time series are periodic, e.g. annual cycles.