Yes, this is the intended behaviour.  If you don't like it, then, as a 
workaround, you could try to clear the variable called 
"sage_configurable_latex_macros".  YMMV, but this works for me in a fresh 
sage session:
    sage: from sage.misc.latex_macros import sage_configurable_latex_macros
    sage: global sage_configurable_latex_macros
    sage: 
sage_configurable_latex_macros.remove("\\newcommand{\\Bold}[1]{\\mathbf{#1}}")
If I now type "html(x)", then the result is "<html>\[x\]</html>", instead 
of "<html>\[\newcommand{\Bold}[1]{\mathbf{#1}}x\]</html>".

If that gives errors due to a bad definition of "\\Bold", then maybe you 
should also do:
    sage: 
sage_configurable_latex_macros.append("\\renewcommand{\\Bold}[1]{\\mathbf{#1}}")

On Sunday, December 19, 2021 at 7:34:13 AM UTC-7 AlbertHilb wrote:

> Hi all. 
>
> I noted every command LaTeX output is prefaced by the definition of a 
> \Bold newcommand even if the \Bold command is not really used in the 
> output.
> For example, if I type "1" and press return I get
>
> \newcommand{\Bold}[1]{\mathbf{#1}}1
>
> Is this intended?
>
> Among other things, the presence of the newcommand definition prevent me 
> from using KaTeX as LaTeX renderer because it complains \Bold command 
> already exists and \renewcommand should be used to redefine it.
>
> I use SageMath 9.4 binary for Ubuntu 20.04 64 bit with jupyterlab 3.2.4 as 
> frontend.
>
>

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