File:Bipolar coordinates.svg
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 18:20, 27 July 2021 | 700 × 700 (14 KB) | Puck04 | == {{int:filedesc}} == {{Information |Description={{en|1=Illustration of the bipolar coordinate system.<p>'''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.}} |Source=PNG version, made by user WillowW |Date=2021-07-27 |Author=vector graphics: [... |
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