Math & Science ⇒ Alignat: number group of equations as one

[kunigami]

Hi all,

I'd like to know if I can number all the equations in alignat as one.

The default behaviour is number each line:

Code: Select all

Code, edit and compile here:

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\begin{alignat}{3}
    a & \quad b & \quad c \\
    d & \quad e & \quad f \\
    g & \quad h & \quad i    
\end{alignat}
 
 
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Run LaTeX here

Researching here at the forum I found a way to number only the last equation:

Code: Select all

Code, edit and compile here:

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\begin{alignat}{3}
    a & \quad b & \quad c \notag \\
    d & \quad e & \quad f \notag \\
    g & \quad h & \quad i    
\end{alignat}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Run LaTeX here

But I'd like to place the number in the middle of this group, using a more elegant way than using \notag.

Thanks!

[phi]

Use the alignedat environment instead:

Code: Select all

Code, edit and compile here:

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\begin{equation}
  \begin{alignedat}{3}
    a & \quad b & \quad c \\
    d & \quad e & \quad f \\
    g & \quad h & \quad i   
  \end{alignedat}
\end{equation}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Run LaTeX here

[kunigami]

Exactly what I needed!

Thanks,