Issue

[Alberto Zanoni]

Good morning,

                         in https://www.lmfdb.org/NumberField/2.0.4.1 (bottom)

Is it p ≡ 3 (mod 4) or p ≡ 1 (mod 4) ?

Best regards.

Alberto Zanoni

[John Cremona]

On Fri, 10 Feb 2023 at 08:40, Alberto Zanoni <alberto...@iisenzoferrari.it> wrote:

Good morning,

                         in https://www.lmfdb.org/NumberField/2.0.4.1 (bottom)

Is it p ≡ 3 (mod 4) or p ≡ 1 (mod 4) ?

Thank you for your report.   The text says "...$p$ can be written as the sum of two squares if and only if $p\not\equiv 3\pmod 4$, ..."  -- note the \not.  This is correct.

John Cremona

 

Best regards.

Alberto Zanoni

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[John Cremona]

---------- Forwarded message ---------
From: Alberto Zanoni <alberto...@iisenzoferrari.it>
Date: Fri, 10 Feb 2023 at 10:29
Subject: Re: Issue
To: John Cremona <john.c...@gmail.com>

Dear Mr. Cremona,

                                 thank you very much for your answer. The "problem" (I discovered it now) is that I set my Firefox browser in order to use customized colors, instead of default ones. Setting grey for the background (so that my screen is not too bright) and imposing Firefox to use my settings the "\not" sign is not visible (strangely, the "\equiv" sign is). Using the original color settings everything is fine, the ≢sign appears.

I did not know there could be such a problem, or that it could depend on color settings. Did you try to check what happens to the page on your browser in this case ? Is there any solution for this issue ?

Best regards,

Alberto Zanoni

[Edgar Costa]

This is not a problem with lmfdb.

I am not sure how you are imposing your color settings, but that is something not standard, and that is what is causing the issue.

You can try to report your bug to katex, which is what we use render math symbols, but I'm expect you will get the same answer.

Best,

Edgar

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[John Cremona]

Please do not send me personal emails on this issue.  I will forward it to lmfdb-support.

On Tue, 14 Feb 2023 at 09:17, Alberto Zanoni <alberto...@iisenzoferrari.it> wrote:

Dear Mr. Cremona,

                               I got this reply from the Mozilla support forum: could it be of some interest for you ? Please let me know, thank you in advance.

Best regards,

Alberto Zanoni

-------------------------------

It look like the katex-html code doesn't have the code to show the '/' on top of the equal '≡' (<span class="mrel">≡</span>) like is done with the katex-mathml code (<mo>≢</mo>). So if disabling the website code makes Firefox switch to the katex-html code then that can cause the '/' to get lost. I don't know whether the website generates both versions of the code or that otherwise something goes wrong here.

[John Cremona]

---------- Forwarded message ---------
From: Alberto Zanoni <alberto...@iisenzoferrari.it>
Date: Tue, 14 Feb 2023 at 09:17
Subject: Re: Issue
To: John Cremona <john.c...@gmail.com>