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Summary

Description
English: Illustration of the bipolar coordinate system. σ is the angle between the two foci and the point in question, whereas τ is the logarithm of the ratio of the distances. The corresponding σ and τ isosurfaces are shown in red and blue, respectively.
Date
Source Own work
Author user:WillowW: This image was made by me using Xfig and is licensed under the GFDL.
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Licensing

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GNU head Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.
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attribution share alike 		This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
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inception

24 October 2006

media type

image/png

checksum

a93844eb08475cb7daf95e1ddd1c841fd55aae94

determination method or standard: SHA-1

data size

3,925 byte

height

280 pixel

width

246 pixel

File history

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Date/TimeThumbnailDimensionsUserComment
current14:34, 24 October 2006Thumbnail for version as of 14:34, 24 October 2006246 × 280 (4 KB)WillowWUpdated to label the point P. Otherwise, the same as first version.
14:18, 24 October 2006Thumbnail for version as of 14:18, 24 October 2006246 × 289 (4 KB)WillowWIllustration of the bipolar coordinate system. σ is the angle between the two foci and the point in question, whereas τ is the logarithm of the ratio of the distances. The corresponding σ and τ isosurfaces are shown in red and blue, respectively. T
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