Latex AMS align / Align multiple "=", too much space
This should work:
\begin{alignat}{2}
A &= B & &= C \\
D &= E & &= F
\end{alignat}
From ams guide:
A variant environment alignat allows the horizontal space between equations to be explicitly specified. This environment takes one argument, the number of “equation columns”: count the maximum number of &s in any row, add 1 and divide by 2.
Its not exactly intended for what you are trying to do, but since align insists on adding space... The idea behind align is:
l&=r & l&=r \\
l&=r & l&=r
One '&' per function, and a '&' between functions.
I would hope there is a better solution though.
(6½ to 8 years later)
What about using array
with a custom separator?
\begin{array}{r@{\ }c@{\ }l}
A &= B &= C \\
D &= E &= F
\end{array}