2019-08-11 16:05:54 -0500 | asked a question | How to find a CM point with the image in the elliptic curve under modular parametrization given everyone! Let $E:y^2+y=x^3-61$ be the minimal model of the elliptic curve 243b. How can I find the CM point $\tau$ in $X_0(243)$ such that $\tau$ maps to the point $(3\sqrt[3]{3},4)$ under the modular parametrization? Can anyone tell me the answer or how to use sagemath to find it? I use the sagemath code to get the parametrization of y coordinate, then I use to get the numerical $e^{2\pi i \tau}$. After taking log and dividing by $2 \pi i$, I get the numerical $\tau$. But if I use I get the wrong polynomial. Why? |

2017-03-28 18:38:01 -0500 | received badge | ● Nice Question (source) |

2017-03-20 05:33:45 -0500 | commented answer | How to use many cpus to compute in sage Thank you very much! I modified the code into following @parallel(ncpus=47) def P(i,j): I=[1..1000] for i,j in itertools.product([1..100],I): P(i,j) but seems no effect. What is the reason? |

2017-03-19 04:22:40 -0500 | received badge | ● Student (source) |

2017-03-18 19:48:48 -0500 | asked a question | How to use many cpus to compute in sage There is an server with 48 cpus in my office. I want to use all of them to compute the following codes in sage. How can I do that? |

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