Render LaTeX expression in SageMath 9.3

edit

Known bug, fixed at

• Sage Trac ticket 31629

which already has positive review and should go in Sage 9.4.

Since the branch at that ticket only tchanges .py files, it is easy enough to apply to your Sage.

If you installed Sage 9.3 from source or from binaries (rather than "via a package manager"), you can apply the fix to your current Sage installation by running the following commands in a terminal:

$ cd $(sage -c "print(SAGE_ROOT)")
$ git remote add trac git://trac.sagemath.org/sage.git -t develop
$ git checkout -b 31629
$ git fetch trac u/klee/31629
$ git merge FETCH_HEAD
$ ./sage -b

Next time you start Sage, it should have the fix.

Next time you want to upgrade Sage, start by checking out the develop branch:

$ git checkout develop
$ git pull origin develop
$ ./bootstrap -q && ./configure -q && make -s V=0

Until Trac #31629 is merged (cf. @slelievre 's answer), a possible workaround is to define a subclass of LatexExpr relying on Jupyter's native LaTeX rendering (not Sage's one), as follows:

class LatexExprFix(LatexExpr):
    def _repr_latex_(self):
        return '$' + str(self) + '$'

It suffices to type the above code in a cell of the Jupyter notebook. Then

LatexExprFix(r'\infty')

displays the LaTeX-rendered formula.

However this does not work with %display latex. If you have some part of the notebook with %display latex, you have to revert to plain display with %display plain before using LatexExprFix. Maybe this can be improved...