# Polar coordinates questions [closed]

Using polar coordinates, create a system with a fixed point at the origin, and with infinitely many periodic orbits which alternate between clockwise and counterclockwise flows.

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## closed as too localized by Andrés Caicedo, Rahul, J. M. is back., Akhil MathewApr 6 '11 at 15:28

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You might want to edit the title of this question. –  Jesse Madnick Apr 5 '11 at 7:33
Why did you delete the body of the question? –  Rahul Apr 6 '11 at 6:15
in general it is vastly preferable that we keep the contents of question statements as self-contained on this website as possible. Therefore I reverted your edit which replaced the above question Text with a Linked Image. Your edits to this question may be interpreted as borderline vandalism, please refrain from that in the future. –  Willie Wong Apr 6 '11 at 12:54
Please do not ask questions in imperative. –  user5501 Apr 6 '11 at 13:08

$re^{i\theta} \longrightarrow re^{i(\theta+ (-1)^{[\frac{r}{2 \pi}]}r)}$
start with circles $(r\cos\theta,r\sin\theta)\mapsto(-\sin\theta,\cos\theta)$. now vary the magnitude, say by $\sin r$: $$(r\cos\theta,r\sin\theta)\mapsto(\sin r)(-\sin\theta,\cos\theta)$$