Error when converting a Jupyter notebook with formula to pdf

[stefkuypers]

Description

I wanted to convert a paper I wrote (Jupyter notebook) to pdf using Quarto. The following line in the notebook gives me an error:

 $P$. $0 \lt d \le 1$

The error reported is the following:

ERROR: 
compilation failed- error
Undefined control sequence.
l.169 \(P\). \(0 \lt
                   d \le 1\)

Does anyone have any idea what is wrong? This should not result in an error I think. I'm using Quarto 1.10.13.

[mcanouil]

@stefkuypers Could you share a small self-contained "working" (reproducible) example to work with, i.e., a complete Quarto document or a Git repository? The goal is to make it as easy as possible for us to recreate your problem so that we can fix it: please help us help you! Thanks.
Providing out of context code snippets is unlikely to help you getting any help.

FYI, you can use keep-tex: true to keep the LaTeX output and you can also check at the LaTeX engine logs to better understand the issue.

---

You can share a self-contained "working" (reproducible) Quarto document using the following syntax, i.e., using more backticks than you have in your document (usually four ````).
See https://quarto.org/bug-reports.html#small-is-beautiful-aim-for-a-single-document-with-10-lines.

If you have multiple files (and if it is absolutely required to have multiple files), please share as a Git repository.

R	Python
````qmd --- title: "Reproducible Quarto Document" format: html engine: knitr --- This is a reproducible Quarto document. {{< lipsum 1 >}} ```{r} x <- c(1, 2, 3, 4, 5) y <- c(1, 4, 9, 16, 25) plot(x, y) ``` {#fig-placeholder} {{< lipsum 1 >}} The end after @fig-placeholder. ````	````qmd --- title: "Reproducible Quarto Document" format: html engine: jupyter --- This is a reproducible Quarto document. {{< lipsum 1 >}} ```{python} import matplotlib.pyplot as plt x = [1, 2, 3, 4, 5] y = [1, 4, 9, 16, 25] plt.plot(x, y) plt.show() ``` {#fig-placeholder} {{< lipsum 1 >}} The end after @fig-placeholder. ````

Additionally and if not already given, please share the output of quarto check within a code block (i.e., using three backticks ```txt), see https://quarto.org/bug-reports.html#check.

[stefkuypers]

I should have been a bit clearer. I created a file with only the line:

$P$. $0 \lt d \le 1$

and named it test.ipynb

Then I ran:

quarto render test.ipynb --to pdf

and got the error I mentioned.

I added

---
keep-tex: true
---

to the top of the file but that did not solve the problem.

[mcanouil]

The issue is that \lt is not a valid LaTeX command. It's a MathJax/KaTeX command.
In LaTeX, you usually write a plain <.

[mcanouil]

FWIW, a plain search on the internet shows this directly, like this thread: https://tex.stackexchange.com/questions/380840/why-it-causes-this-undefined-control-sequence-after-lt

[stefkuypers]

Thank you!