File:NotNull.png
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NotNull.png (500 × 448 pixels, file size: 29 KB, MIME type: image/png)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 16:21, 14 December 2007 | ![]() | 500 × 448 (29 KB) | commons>W>Frank 1729 | I made this image using OpenOffice Draw. It illustrates a contour that is not null-homotopic in an open set ''U''. {{PD-self}} |
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