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<math>a_1..a_n</math>
This is a cheat sheet on which code / markdown notation leads to which MathJax output.
 
[https://www.mathjax.org/ MathJax] is an open-source JavaScript display engine for LaTeX, MathML, and AsciiMath notation that works in all modern browsers.
 
== MathJax in Obsidian.md ==
When using MathJax inside Obsidian.md the markdown code representing the MathJax formula needs start and end with the dollar sign, i.e.: <code>$a_1..a_n$</code>
 
In order to show fractions a little bit bigger and centered use two dollar signs, i.e.: <code><nowiki>$$a = \frac{\sqrt{b^2 + c^2}}{2}$$</nowiki></code>
 
Printing little bigger works too with <code>$\displaystyle$</code> ahead of the fraction
 
== Cheatsheet ==
 
=== Formatting ===
{| class="wikitable" style="background-color:#ffffff;"
!Description
!Example
!LaTeX Code / Markdown
|-
|Fractions
|<math>\frac{km}{h}</math>
|<code>\frac{km}{h}</code>
|-
|Text with spaces
|<math>\text{kilometers or miles}</math>
|<code>\text{kilometers or miles}</code>
|-
|Superscript / Exponent
|<math>a^2 + b^2 = c^2</math>
|<code>a^2 + b^2 = c^2</code>
|-
|Subscript
|<math>a_1..a_n</math>
|<code>a_1..a_n</code>
|-
|Double Subscript
|<math>r_{0_1} + r_{0_2} + ... + r_{0_n}</math>
|<code>{r_{0_1}​​ + r_{0_2} ​+ ... + r_{0_n}</code>
|}
 
=== Arithmetic ===
{| class="wikitable" style="background-color:#ffffff;"
!Description
!Example
!LaTeX Code / Markdown
|-
|times
|<math>a \cdot b</math>
|<code>a \cdot b</code>
|-
|times
|<math>a \times b</math>
|<code>a \times b</code>
|-
|divided by
|<math>a \div b</math>
|<code>a \div b</code>
|-
|plus minus
|<math>\pm x</math>
|<code>\pm x</code>
|-
|minus plus
|<math>\mp x</math>
|<code>\mp x</code>
|-
|equal
|<math>=</math>
|<code>\=</code>
|-
|not equal
|<math>\neq</math>
|<code>\neq</code>
|-
|around
|<math>\approx</math>
|<code>\approx</code>
|-
|less than or equal
|<math>a \le b</math>
|<code>a \le b</code> or <code>a \leq b</code>
|-
|less than or equal
|<math>a \leqq b</math>
|<code>a \leqq b</code>
|-
|greater than or equal
|<math>a \ge b</math>
|<code>a \ge b</code> or <code>a \geq b</code>
|-
|greater than or equal
|<math>a \geqq b</math>
|<code>a \geqq b</code>
|}
 
=== Symbols ===
{| class="wikitable" style="background-color:#ffffff;"
!Description
!Example
!LaTeX Code / Markdown
|-
|Infinity
|<math>\infty</math>
|<code>\infty</code>
|-
|Absolute
|<math>\vert x \vert</math>
|<code>\vert x \vert</code>
|-
|Overline one character
|<math>\overline a</math>
|<code>\overline a</code>
|-
|Overline multiple characters
|<math>\overline {AB}</math>
|<code>\overline {AB}</code>
|-
|Hat over one character
|<math>\hat a</math>
|<code>\hat a</code>
|-
|Hat over two characters
|<math>\widehat {ab}</math>
|<code>\widehat {ab}</code>
|-
|Sum of a set
|<math>\sum_{i=1}^n a_i</math>
|<code>\sum_{i=1}^n a_i</code>
|-
|Sum of a set (larger)
|<math>\displaystyle \sum_{i=1}^n a_i</math>
|<code>\displaystyle \sum_{i=1}^n a_i</code>
|}
 
=== Greek Letters ===
{| class="wikitable" style="background-color:#ffffff;"
!Description
!Example
!LaTeX Code / Markdown
|-
|phi
|<math>\phi</math>
|<code>\phi</code>
|-
|epsilon
|<math>\epsilon</math>
|<code>\epsilon</code>
|-
|sigma
|<math>\sigma</math>
|<code>\sigma</code>
|}
 
=== Constants ===
{| class="wikitable" style="background-color:#ffffff;"
!Description
!Example
!LaTeX Code / Markdown
|-
|Pi
|<math>\pi</math>
|<code>\pi</code>
|-
|Euler's Number
|<math>\mathrm{e}</math>
|<code>\mathrm{e}</code>
|}
 
=== Matrices ===
{| class="wikitable" style="background-color:#ffffff;"
!Description
!Example
!LaTeX Code / Markdown
|-
|Matrix with Parentheses
|<math>\begin{pmatrix}
0 & 1 \\
1 & 0
\end{pmatrix}</math>
|
\begin{pmatrix}
0 & 1 \\
1 & 0
\end{pmatrix}
|-
|Matrix with Brackets
|<math>\begin{bmatrix}
0 & 1 \\
1 & 0
\end{bmatrix}</math>
|
\begin{bmatrix}
0 & 1 \\
1 & 0
\end{bmatrix}
|-
|Complex Matrix with Parentheses
|<math>\begin{pmatrix}
& Bob & Alice \\
Bob & 0 & 1 \\
Alice & 1 & 0
\end{pmatrix}</math>
|
\begin{pmatrix}
  & ​Bob & Alice \\
Bob & 0 & 1 \\
Alice & 1 & 0 
\end{pmatrix}
|}
 
 
== Sources ==
I found the following sources which helped me out:
 
* https://de.wikipedia.org/wiki/Liste_mathematischer_Symbole (German)
* https://en.wikipedia.org/wiki/Glossary_of_mathematical_symbols
* https://math.meta.stackexchange.com/questions/5020/mathjax-basic-tutorial-and-quick-reference
* https://easy-copy-mathjax.nakaken88.com/en/matrix/
* https://jojozhuang.github.io/tutorial/mathjax-cheat-sheet-for-mathematical-notation/
* https://bearnok.com/grva/en/knowledge/software/mathjax

Aktuelle Version vom 20. September 2025, 20:47 Uhr

This is a cheat sheet on which code / markdown notation leads to which MathJax output.

MathJax is an open-source JavaScript display engine for LaTeX, MathML, and AsciiMath notation that works in all modern browsers.

MathJax in Obsidian.md

When using MathJax inside Obsidian.md the markdown code representing the MathJax formula needs start and end with the dollar sign, i.e.: $a_1..a_n$

In order to show fractions a little bit bigger and centered use two dollar signs, i.e.: $$a = \frac{\sqrt{b^2 + c^2}}{2}$$

Printing little bigger works too with $\displaystyle$ ahead of the fraction

Cheatsheet

Formatting

Description Example LaTeX Code / Markdown
Fractions kmh \frac{km}{h}
Text with spaces kilometers or miles \text{kilometers or miles}
Superscript / Exponent a2+b2=c2 a^2 + b^2 = c^2
Subscript a1..an a_1..a_n
Double Subscript r01+r02+...+r0n {r_{0_1}​​ + r_{0_2} ​+ ... + r_{0_n}

Arithmetic

Description Example LaTeX Code / Markdown
times a⋅b a \cdot b
times a×b a \times b
divided by a÷b a \div b
plus minus ±x \pm x
minus plus ∓x \mp x
equal = \=
not equal ≠ \neq
around ≈ \approx
less than or equal a≤b a \le b or a \leq b
less than or equal a≦b a \leqq b
greater than or equal a≥b a \ge b or a \geq b
greater than or equal a≧b a \geqq b

Symbols

Description Example LaTeX Code / Markdown
Infinity ∞ \infty
Absolute |x| \vert x \vert
Overline one character a‾ \overline a
Overline multiple characters AB‾ \overline {AB}
Hat over one character a^ \hat a
Hat over two characters ab^ \widehat {ab}
Sum of a set ∑i=1nai \sum_{i=1}^n a_i
Sum of a set (larger) ∑i=1nai \displaystyle \sum_{i=1}^n a_i

Greek Letters

Description Example LaTeX Code / Markdown
phi ϕ \phi
epsilon ϵ \epsilon
sigma σ \sigma

Constants

Description Example LaTeX Code / Markdown
Pi π \pi
Euler's Number e \mathrm{e}

Matrices

Description Example LaTeX Code / Markdown
Matrix with Parentheses (0110) 
\begin{pmatrix}
0 & 1 \\ 
1 & 0
\end{pmatrix}
Matrix with Brackets [0110] 
\begin{bmatrix}
0 & 1 \\ 
1 & 0
\end{bmatrix}
Complex Matrix with Parentheses (BobAliceBob01Alice10) 
\begin{pmatrix}
 & ​Bob & Alice \\
Bob & 0 & 1 \\
Alice & 1 & 0  
\end{pmatrix}


Sources

I found the following sources which helped me out:

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