How to write LaTeX in IPython Notebook?

This came up in a search I was just doing, found a better solution with some more searching, IPython notebooks now have a %%latex magic that makes the whole cell Latex without the $$ wrapper for each line.

Refer notebook tour for Rich Display System

LaTeX References:

Udacity's Blog has the Best LaTeX Primer I've seen: It clearly shows how to use LaTeX commands in easy to read, and easy to remember manner !! Highly recommended.

This Link has Excellent Examples showing both the code, and the rendered result !
You can use this site to quickly learn how to write LaTeX by example.

And, here is a quick Reference for LaTeX commands/symbols.

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To Summarize: various ways to indicate LaTeX in Jupyter/IPython:

Examples for Markdown Cells:

inline, wrap in: $

The equation used depends on whether the the value of  
$V​max​​$ is R, G, or B.  

block, wrap in: $$

$$H←  ​​​​​0 ​+​ \frac{​​30(G−B)​​}{Vmax−Vmin}  ​​, if V​max​​ = R$$

block, wrap in: \begin{equation} and \end{equation}

\begin{equation}
H← ​​​60 ​+​ \frac{​​30(B−R)​​}{Vmax−Vmin}  ​​, if V​max​​ = G
\end{equation}

block, wrap in: \begin{align} and \end{align}

\begin{align}
H←120 ​+​ \frac{​​30(R−G)​​}{Vmax−Vmin}  ​​, if V​max​​ = B
\end{align}

Examples for Code Cells:

LaTex Cell: %%latex magic command turns the entire cell into a LaTeX Cell

%%latex
\begin{align}
\nabla \cdot \vec{\mathbf{E}} & = 4 \pi \rho \\
\nabla \times \vec{\mathbf{E}}\, +\, \frac1c\, \frac{\partial\vec{\mathbf{B}}}{\partial t} & = \vec{\mathbf{0}} \\
\nabla \cdot \vec{\mathbf{B}} & = 0
\end{align}

Math object to pass in a raw LaTeX string:

from IPython.display import Math
Math(r'F(k) = \int_{-\infty}^{\infty} f(x) e^{2\pi i k} dx')

Latex class. Note: you have to include the delimiters yourself. This allows you to use other LaTeX modes such as eqnarray:

from IPython.display import Latex
Latex(r"""\begin{eqnarray}
\nabla \times \vec{\mathbf{B}} -\, \frac1c\, \frac{\partial\vec{\mathbf{E}}}{\partial t} & = \frac{4\pi}{c}\vec{\mathbf{j}} \\
\nabla \cdot \vec{\mathbf{E}} & = 4 \pi \rho \\
\nabla \times \vec{\mathbf{E}}\, +\, \frac1c\, \frac{\partial\vec{\mathbf{B}}}{\partial t} & = \vec{\mathbf{0}} \\
\nabla \cdot \vec{\mathbf{B}} & = 0 
\end{eqnarray}""")

Docs for Raw Cells:

(sorry, no example here, just the docs)

Raw cells Raw cells provide a place in which you can write output directly. Raw cells are not evaluated by the notebook. When passed through nbconvert, raw cells arrive in the destination format unmodified. For example, this allows you to type full LaTeX into a raw cell, which will only be rendered by LaTeX after conversion by nbconvert.

Additional Documentation:

For Markdown Cells, as quoted from Jupyter Notebook docs:

Within Markdown cells, you can also include mathematics in a straightforward way, using standard LaTeX notation: $...$ for inline mathematics and $$...$$ for displayed mathematics. When the Markdown cell is executed, the LaTeX portions are automatically rendered in the HTML output as equations with high quality typography. This is made possible by MathJax, which supports a large subset of LaTeX functionality

Standard mathematics environments defined by LaTeX and AMS-LaTeX (the amsmath package) also work, such as \begin{equation}...\end{equation}, and \begin{align}...\end{align}. New LaTeX macros may be defined using standard methods, such as \newcommand, by placing them anywhere between math delimiters in a Markdown cell. These definitions are then available throughout the rest of the IPython session.

IPython notebook uses MathJax to render LaTeX inside html/markdown. Just put your LaTeX math inside $$.

$$c = \sqrt{a^2 + b^2}$$

Or you can display LaTeX / Math output from Python, as seen towards the end of the notebook tour:

from IPython.display import display, Math, Latex
display(Math(r'F(k) = \int_{-\infty}^{\infty} f(x) e^{2\pi i k} dx'))