# Rendering errors (<chem> and <math>)

See original GitHub issueNote from @BoboTiG: issue tightly coupled to #1183, interesting details can be found there too.

I did a fresh download and render of the EN wiktionary today, and got the following errors:

```
>>> Loading data/en/data_wikicode-20220120.json ...
>>> Loaded 1,038,672 words from data/en/data_wikicode-20220120.json
<chem> ERROR with ^-N=\overset{+}N=N^- in [azide]
<math> ERROR with \begin{align}\frac{\pi}{2} & = \prod_{n=1}^{\infty} \frac{ 4n^2 }{ 4n^2 - 1 } = \prod_{n=1}^{\infty} \left(\frac{2n}{2n-1} \cdot \frac{2n}{2n+1}\right) \\[6pt]& = \Big(\frac{2}{1} \cdot \frac{2}{3}\Big) \cdot \Big(\frac{4}{3} \cdot \frac{4}{5}\Big) \cdot \Big(\frac{6}{5} \cdot \frac{6}{7}\Big) \cdot \Big(\frac{8}{7} \cdot \frac{8}{9}\Big) \cdot \; \cdots \\\end{align} in [Wallis product]
<math> ERROR with \begin{align}a_0 &+ a_1x + a_2x^2 + a_3x^3 + \cdots + a_nx^n \\ &= a_0 + x \bigg(a_1 + x \Big(a_2 + x \big(a_3 + \cdots + x(a_{n-1} + x \, a_n) \cdots \big) \Big) \bigg).\end{align} in [Horner's rule]
<math> ERROR with \frac = \frac in [circle of Apollonius]
<math> ERROR with \begin{align}\rho(g, h) (0,x_1,\ldots,x_k) &= g(x_1,\ldots,x_k) \\\rho(g, h) (y+1,x_1,\ldots,x_k) &= h(y,\rho(g, h) (y,x_1,\ldots,x_k),x_1,\ldots,x_k)\,\end{align} in [primitive recursion]
>>> Saved 697,169 words into data/en/data-20220120.json
>>> Render done!
```

### Issue Analytics

- State:
- Created 2 years ago
- Comments:19 (13 by maintainers)

#### Top Results From Across the Web

Math rendering errors? - Physics Meta - Stack Exchange

Recently,and my browser and configuration have not changed, hardly any maths formulas are exhibited in the question.

Read more >Category:Articles with math render errors - Wikipedia

Description: This category lists page and articles, which have errors when rendering the <math> tag caused by temporary error in the mathematics rendering...

Read more >Error Analysis

Every lab report must have an error analysis. For many experiments, significant figure rules are sufficient. For a brush up on significant figure...

Read more >Chemistry notation using mhchem - MoodleDocs

Therefore, the chemical display of chemical formulae and equations is simulated and may not exactly correspond to rendering using mhchem, which ...

Read more >14.Errors - Madoverchemistry

Thus, today we start our discussion of Analytical Chemistry with a… ... in our measurement renders our experimental data insignificant.

Read more >#### Top Related Medium Post

No results found

#### Top Related StackOverflow Question

No results found

#### Troubleshoot Live Code

Lightrun enables developers to add logs, metrics and snapshots to live code - no restarts or redeploys required.

Start Free#### Top Related Reddit Thread

No results found

#### Top Related Hackernoon Post

No results found

#### Top Related Tweet

No results found

#### Top Related Dev.to Post

No results found

#### Top Related Hashnode Post

No results found

## Top GitHub Comments

I was also curious if svg could be used on Kobo. And it can ! dicthtml-en-en.zip (11,819 bytes)

PNG:

GIF

SVG

dictgen mentions GIF and JPG https://pgaskin.net/dictutil/dictgen/ In theory, Kobo should support PNG https://help.kobo.com/hc/fr/articles/360017763713-Formats-de-fichiers-pris-en-charge-par-votre-application-Kobo-eReader-et-Kobo-Books but not sure if the support is included for dictionaries.