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Lately I keep getting “invalid XML” errors here with math-typesetting that used to work and that does work on the nLab. For instance the following comment doesn’t display, and I don’t understand why:
<p>The <a href="https://ncatlab.org/nlab/show/connecting homomorphism">connecting homomorphism</a> is really</p>
<dl>
$$
\delta_n
=
H_n
\left(
\array{
cone(f)_\bullet &\to& X[1]_\bullet
\
\downarrow^{\mathrlap{\simeq}}
\
Z_\bullet
}
\right)
\;\;
<dd>
\;\;
H_n(Z_\bullet) \to H_{n-1}(X_\bullet)
$$</dd>
</dl>
Does anyone see what’s wrong? I don’t see it. (My apologies if there is an evident syntax error there which I don’t see. Maybe I am being stupid, but I think I have copy-and-pasted this right away from an nlab source where it does display fine.)
That is both weird and obscure and a definite bug. The problem is that the : on a line by itself is confusing the Markdown processor because
word
: explanation
is the Markdown syntax for a definition list:
So the processor is seeing the : and turning it into a definition list before the display maths is getting seen. Clearly, my ordering of when things should happen is wrong here and I’ll have to delve back in the code to fix it. In the meantime, don’t start a line with a colon!
The connecting homomorphism is really
(Worth remembering that while I’ve tried to emulate the nLab Maruku+itex parser as closely as I can, I’m using a different language on the forum and thus a different Markdown processor so on occasion things will go wrong, or at least differently. I will try to correct these when I can, but not to the extent that I have to rewrite the nLab Maruku processor in PHP so there will always be some differences.)
Thanks!!
There’s at least one thing that goes right on the Forum but not the Lab: links like [[infinity-groupoid|$\infty$-groupoid]]. (They both can do [$\infty$-groupoid](http://ncatlab.org/nlab/show/infinity-groupoid), and neither can do [[$\infty$-groupoid]].)
If you ever feel like adding to the nForum’s Markdown capabilities, it would make me very happy if it would parse – and — into – and —. (-:
That and the smart quotes are the most obvious mismatch when people move discussion from the Lab to here.
Remind me, what are “smart quotes”?
Okay, I think I know. Let’s have a go with an – endash, an — emdash, something “quoted”, something “quoted” (although that probably won’t work as the backticks might be interpreted as code).
Nice; there are a few discrepancies with single quotation marks. On the Lab, we can escape these, which here only works with double quotation marks and dashes. Also, the single quotation marks don't make the correct shape on the left like the double ones do (and like they do on the Lab).
Another discrepancy is that the lab can't handle the TeX-style quotation marks, but in this case, I would say that the Forum is better and it's Instiki that should change. Similarly, the Forum shapes double quotation marks correctly on the left before special characters (example: “”), which the Lab gets wrong.
H'm, ignore that first discrepancy; I must have just typed something wrong. The second discrepancy is also in the proper thread (noted by Mike), so you can ignore the entire first paragraph above.
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