j-maps on modular curves

[Christian Wuthrich]

Hi

I have been a very happy user of the modular curves database in the beta version. I wanted to use the j-map on some of them, but I can't get them as they are too long for the screen and there is no copy function built in. (I believe https://github.com/LMFDB/lmfdb/issues/6930 asks for this).

Specifically, could someone send me the j-maps for

https://beta.lmfdb.org/ModularCurve/Q/19.171.8.a.1/

https://beta.lmfdb.org/ModularCurve/Q/17.136.6.a.1/ ?

(13 and 11 I was able to copy and edit).

I also wanted to point out that some, like

https://beta.lmfdb.org/ModularCurve/Q/5.10.0.a.1/

have factors appearing in both the numerator and the denominator, which would be good to simplify.

Many thanks

Chris

[David Roe]

Hi Chris,

We're hoping to have the improved version of the database out this summer, which will fix the issues that you mention.  In the meantime, you can get the j-maps by clicking on the "Underlying data" link to the right and scrolling down to the section on modcurve_modelmaps. See https://beta.lmfdb.org/ModularCurve/data/19.171.8.a.1 and https://beta.lmfdb.org/ModularCurve/Q/17.136.6.a.1 for your examples.

David

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[Christian Wuthrich]

Great. Thanks a lot (for the effort to improve things, too.)

Chris