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With this demonstration of 'LatexExpr' you have given me all the answers I need. Thanks, rburing! Looking around, I have found Sage, LaTeX and Friends (https://doc.sagemath.org/html/en/tutorial/latex.html) LaTeX macros (https://doc.sagemath.org/html/en/reference/misc/sage/misc/latex_macros.html) and Using SageTeX (https://doc.sagemath.org/html/en/tutorial/sagetex.html). None of them contain the string "LatexExpr." If you can suggest documentation for it, I would appreciate seeing it, but I now consider this question answered.

If I can figure out how to upvote or thumbs-up your avatar, I will do so.