Seifert Surface (IMAGE) American Mathematical Society Caption Seifert surface. Credit Images by Etienne Ghys/Jos Leys. Usage Restrictions Request permission from Etienne Ghys and jos Leys. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.