[PYTHON] How to display formulas in latex when using sympy (> = 1.4) in Google Colaboratory

Solution

!pip install --upgrade sympy
from sympy import *

def custom_latex_printer(expr, **options):
    from IPython.display import Math, HTML
    from google.colab.output._publish import javascript
    url = "https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.7/MathJax.js?config=TeX-AMS_CHTML"
    javascript(content="""window.MathJax = {
        tex2jax: {
            inlineMath: [ ['$','$'] ],
            processEscapes: true
        }
        };""")
    javascript(url=url)
    return latex(expr, **options)
init_printing(use_latex="mathjax", latex_printer=custom_latex_printer)

Commentary

Latex output from sympy does not correctly display in Google Colaboratory Jupyter notebooks - Stack Overflow The most common search methods such as sympy1.4 or later are not sufficient.

Release Notes for 1.4 · sympy/sympy Wiki · GitHub

  • By default, LaTeX output in the Jupyter notebook is framed with $\displaystyle ...$. This prevents it from being centered in PDF output from nbconvert (see https://github.com/jupyter/notebook/issues/4060). (#15625 by @mgeier)

(LaTex output defaults to inline math mode.)

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