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LaTeX rendering in the Jupyter notebook is performed by MathJax. Unfortunately, MathJax does not support multicolumn, see
https://docs.mathjax.org/en/v2.7-latest/tex.html ,
in particular the sentence MathJax only implements a limited subset of the array environment’s preamble, i.e., only the l, r, c, and | characters alongside : for dashed lines; everything else is ignored.
