This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Reebfoliationringd.svg en Reeb foliation version torus is represented as ring Reebfoliationringd svg UTC Reebfoliationringd svg Ilya Voyager derivative work Irina Gelbukh talk Irina Gelbukh Reebfoliationringd svg Cczero original upload log This image is derivative work of the following images File Reebfoliationringd