Keywords: Dualger.png PNG of dual curve to the Lemniscate of Gerono created by me en User Gene Ward Smith and released to the public domain created by en User Gene Ward Smith User Gene Ward Smith on http //en wikipedia org en wikipedia page is was here <nowiki> 21 21 19 May 2006 Gene Ward Smith 564×564 6 715 bytes <span class comment > PNG of dual curve to the Lemniscate of Gerono created by me en User Gene Ward Smith and released to the public domain </span> </nowiki> Uploaded using http //tools wikimedia de/~magnus/commonshelper php CommonsHelper or http //tools wikimedia de/~magnus/pushforcommons php PushForCommons Files by User Gene Ward Smith from en wikipedia Lemniscate Dual curves |