Math & Science ⇒ amsmath | Conflict with non-standard Document Class

[timur]

Hi all,

I have an error "LaTeX Error: Command \equation* already defined" when I compile the .tex file which uses ws-ijcis.cls (attached to this post). However, when I comment out the line "\usepackage{amsmath}" the problem goes away.

But I need to use amsmath package for my math formulas.

Could you please advise what to do?

Thanks!

[justdeath]

The class you are using redefines the "equation" environment. So you cannot add "amsmath" after it.

I edited the class you provided and added \usepackage{amsmath} on the 20th line. Seems to be working fine, since this loads "amsmath" before the redefining process.

But if someone else wants to compile your file, you must send him the class file too.

Nikolay

[timur]

Thanks a lot, Nicolay!

That worked just fine!

[timur]

Nikolay,

When I insert \footnotemark in the equation environment and place \footnotetext{...} just after the equation

Code: Select all

\begin{equation*}
\left\{
\begin{aligned}
...,\\
...,\footnotemark,\\
\end{aligned}
\right\}
\end{equation*}
\footnotetext{...}

it gives me an error:

\ijcis\1\ws-ijcis.tex(393): Error: ! Missing } inserted.

What could be the reason for that?

[localghost]

Try \text{\footnotemark} instead.


Thorsten

[timur]

Thanks localghost! It worked!

[timur]

Hi all, again!

I have another problem with the same class definition ws-ijcis.cls. I attach here too.
The error mainly with the lemma environment. I have

Code: Select all

\begin{lemma}\label{lemma_name}
...
\end{lemma}

When I refer to this lemma by

Code: Select all

\ref{lemma_name}

it gives me the following error message:

\ws-ijcis.tex(1115): Error: ! Undefined control sequence.

Any ideas why?

[justdeath]

The class you use is very broken.

It has definitions for lemmas, theorems, but not for labels.

You should use a different class or write to the authors of it.

Nikolay

[timur]

Thanks! I appreciate your help.