Math & Science ⇒ Custom Equation Numbering

[bkarpuz]

Dear all,

I dont know whether i am asking my question in the right subsection, but I could not find the suitable one.
I use \eqref and \label for my equations.
I want to set a custom \tag to an equation as follows:
Suppose that LaTeX assigns (2) to my equation but I want its label to be (2-n).
I used the following code,

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\tag{\theequation-n}\label{myeq2n}
 
 
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but this time I got (1-n).
Should I increase the equation counter?
If so how?

Many thanks.
bkarpuz

[daleif]

\stepcounter{equation}
but be a little carefull about doing it inside math, because some ams constructions typeset the contents twice

[bkarpuz]

\stepcounter{equation}
but be a little carefull about doing it inside math, because some ams constructions typeset the contents twice

Thanks!

But I now realized that what I need is a little bit different.
I label an equation by \label{myeq1} as (1-n) for instance.
And I want to say:
"It is clear that (1-1) holds, suppose now that (1-n) is true, and we will show that (1-(n+1)) is also true".
I think there is no way for this.

Thanks again.

[phi]

That is certainly possible, but please post the formula itself and show precisely how you'd like to write it, then we can look for a good solution.

[bkarpuz]

That is certainly possible, but please post the formula itself and show precisely how you'd like to write it, then we can look for a good solution.

Many thanks phi.
I give a sample code below

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Now, we prove that
\begin{equation}
\|x_{k}(t)-x_{k-1}(t)\|\leq\frac{(t-t_{0})^{k}}{k!}\label{eq1}%I want to show this as (Eq.1-k)
\end{equation}
holds for all $k\in\mathbb{N}$.
It is clear that (Eq.1-1) holds trivially. %call by \eqref.
Next suppose that (Eq.1-k) is true for some $k\in\mathbb{N}$, then we have %call by \eqref.
\begin{equation}
\begin{split}
\|x_{k+1}(t)-x_{k}(t)\|\leq&\cdots\\
=&\frac{(t-t_{0})^{k+1}}{(k+1)!},
\end{split}\notag
\end{equation}
which proves that (Eq.1-(n+1)) holds. %call by \eqref.
 
 
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In the above code, the number 1 in the label (Eq.1-k) is the equation counter.

[bkarpuz]

See http://www.latex-community.org/forum/vi ... 44&t=16543 for the solution.