# Align* environment inside tabbing environment?

#### Ackbach

##### Indicium Physicus
Staff member
Why doesn't this code work?

Code:
\begin{tabbing}\qquad \= 11.\quad \=
\kill

\>1.\>
\begin{align*}
f(x)&=2x+4\\
a&=3\\
\end{align*}
\\
\end{tabbing}
Is it not allowed to put an align* environment inside a tabbing environment?

#### dwsmith

##### Well-known member
Why doesn't this code work?

Code:
\begin{tabbing}\qquad \= 11.\quad \=
\kill

\>1.\>
\begin{align*}
f(x)&=2x+4\\
a&=3\\
\end{align*}
\\
\end{tabbing}
Is it not allowed to put an align* environment inside a tabbing environment?

Have you tried \alignat* ?

#### Ackbach

##### Indicium Physicus
Staff member
\kill

\>1.\>
\begin{alignat*}{1}
f(x)&=2x+4\\
a&=3\\
\end{alignat*}
\\
\end{tabbing}

The alignat* environment didn't work any better than align*, so far as I can see.

#### Evgeny.Makarov

##### Well-known member
MHB Math Scholar
Here is a quote from the User's Guide for the amsmath Package.

Like equation, the multi-equation environments gather, align, and alignat are designed to produce a structure whose width is the full line width. This means, for example, that one cannot readily add parentheses around the entire structure. But variants gathered, aligned, and alignedat are provided whose total width is the actual width of the contents; thus they can be used as a component in a containing expression.
In my test, the environment aligned worked.

#### Ackbach

##### Indicium Physicus
Staff member
Here is a quote from the User's Guide for the amsmath Package.
Like equation, the multi-equation environments gather, align, and alignat are designed to produce a structure whose width is the full line width. This means, for example, that one cannot readily add parentheses around the entire structure. But variants gathered, aligned, and alignedat are provided whose total width is the actual width of the contents; thus they can be used as a component in a containing expression.
In my test, the environment aligned worked.
Wonderful! The quote you so helpfully posted helps me understand why it doesn't work, as well as showing me why the substitute environment does. Fantastic. I'll give it a try when I have some time.

#### Ackbach

##### Indicium Physicus
Staff member
Worked just fine. Had to tweak it a hair to get the alignment what I wanted. Final working code:

Code:
\begin{tabbing}\qquad \= 11.\quad \= \hpsace{0.4\linewidth} \= 11.\quad \=
\kill

\>$\phantom{1}$1.\>
\begin{aligned}[t] f(x)&=2x+4\\ a&=3\\ L&=10\\ \varepsilon&=0.01 \end{aligned}
\>$\phantom{1}$5.\>
\begin{aligned}[t] f(x)&=6x-10\\ a&=-2\\ L&=-22\\ \varepsilon&=0.4 \end{aligned}\\
\end{tabbing}
Thanks much!