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[John Cremona]

Dear Victor,

Thanks for your message to lmfdb-support.  Something went wrong when I tried to approve your message for posting to the list (which is moderated), so I'll reply like this.

Although the graph looks as if it has a node, it does not.  If you right-click on the image and save it to a new window or tab, then you should be able to enlarge it to see that.  You can also see that the three points where the graph crosses the x-axis are the three rational points (x,0) of order 2, which have x-coordinates -2795, 1365, 1430.  Although the last two are not very close, the scale of the graph makes them look close.

John Cremona

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Date: Thu, 25 Mar 2021 at 05:11
Subject: lmfdb-support - Google Groups: Message Pending [{IMWb9Zmug8WGGSoCcWswBofBuh3m4gEI0}]
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---------- Forwarded message ----------
From: Victor Lu <vict...@pg.canterbury.ac.nz>
To: "lmfdb-...@googlegroups.com" <lmfdb-...@googlegroups.com>
Cc: 
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Date: Thu, 25 Mar 2021 05:11:28 +0000
Subject: Elliptic curve 67600.bv2 picture mismatch with roots

Hi,

I was checking a particular elliptic curve with 3 distinct real roots when I noticed the image shows a node where the roots should be. Can you check what's going on here?

https://www.lmfdb.org/EllipticCurve/Q/67600/bv/2

Regards

Victor