Your output looks different than mine when this happens, but I think it's
the same:
there is still a Python text parser operating on your strings before Latex
can get to them.
\nabla will give you \n "newline", \tau will give you \t, etc.
if you type an r before the quotes surrounding the string, e.g.
text(r' now you may $\backslash$ until you can $\backslash$ no more...
uh... forever' )
the line is read without escape codes.
I found this information buried at the bottom of a documentation page, but
I think the real problem is that it is unnatural. SAGE should not read
Python escape codes inside $'s. As you've noticed from the error message,
SAGE doesn't even know it's still doing it. It thinks it's parsing LaTeX.
Unless that's not what's happening to you!
>
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