[Xy-pic] How to resolve "Command \l already defined ..."

[Ross Moore]

Hello Kiravu,

On Apr 10, 2018, at 5:53 PM, KIRAVU, C. (MR.) <cheddi.kiravu at mopipi.ub.bw<mailto:cheddi.kiravu at mopipi.ub.bw>> wrote:

My system has installed:

\usepackage[all]{xy}
\usepackage{tikz-cd}

My LaTeX program includes code statements of the type,

\begin{equation}
\xymatrix {A \ar[r]^f & B \ar[r]^{{\Phi} & H }
\end{equation}

On compiling the LaTeX program the error message on console is:

(/usr/local/texlive/2013/texmf-dist/tex/generic/pgf/frontendlayer/tikz/libraries/tikzlibrarymatrix.code.tex)) (./Definitions.tex

./Definitions.tex:32: LaTeX Error: Command \l already defined
         Or name \end… illegal, see p.192 of manual.

Yes.
 \l  is pre-defined for the Polish letter  l-slash  .
You must *not* redefinine it in your   Definitions.tex  file.



See the LaTeX manual or LaTeX Companion for explanation.
Type H<return> for immediate help.
L l.32 \newcommand{\l}{\v(1)}
?

Alternatively, use  \renewcommand{\l}{\v(1)}

But surely this should be   \v{1}
unless you have also redefined  \v  from its default use as an accent-macro.



Observation: Upon pressing <return> following the above prompt, the program runs to the end and renders the graph correctly.  However I must do this every time I compile my (long) program.  This intermediate manual intervention is annoying and I would like to automate the compilation.

Question: What could I possibly do or go  to remove the conflicting definition?


The message is there to stop you from simply redefining macros that already have other uses.
Please respect this, and don’t just choose macro-definitions based entirely upon what you would
like to use. (La)TeX is a shared system.
Respect that other people’s needs can be greater than your own.



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BTW, what has any of this got to do with Xy-pic ?


Hope this helps.


Dr Ross Moore

Mathematics Dept | 12 Wally’s Walk, 734
Macquarie University, NSW 2109, Australia

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