ASKSAGE: Sage Q&A Forum - RSS feedhttps://ask.sagemath.org/questions/Q&A Forum for SageenCopyright Sage, 2010. Some rights reserved under creative commons license.Tue, 30 Sep 2014 22:33:31 +0200How do I compute the image of the cusp 0 on a modular elliptic curve?https://ask.sagemath.org/question/24350/how-do-i-compute-the-image-of-the-cusp-0-on-a-modular-elliptic-curve/Using the modular parameterization we can get a q-series representation of the map from the upper half plane to the elliptic curve that sends the cusp infinity to the identity of the elliptic curve. However, plugging 0 into this q-series amounts to setting q=1 and the series does not converge. Is there a way to compute the image of 0 in E?Tue, 30 Sep 2014 22:33:31 +0200https://ask.sagemath.org/question/24350/how-do-i-compute-the-image-of-the-cusp-0-on-a-modular-elliptic-curve/