a &= b &+& c &+& d\\
  b &= b &+& c &+& d\\
  c &= b &+& c &+& d\\
  aoeu &= \mathrm{something long here}



How do I remove the space circled in red while keeping the "=" signs circled in green aligned? (Also, I want the "+" signs aligned.)

  • How should the "a", "b", "c", and "d" elements be aligned in their respective columns: left-aligned, centered, or right-aligned? Please advise. – Mico May 18 '18 at 21:43
  • @Mico left-aligned (so there's no space between the "+" and "c" of "+c" or between the "+" and "d" of "+d") – Geremia May 18 '18 at 23:53
  • Thanks for this reply; I've adjusted the code in my answer accordingly. – Mico May 19 '18 at 4:55

I am assuming that your real equation contains more thrilling entries than a, b, c, and d. If that's the case, you may be better off employing a flexible array environment.

enter image description here

\usepackage{array} % for '\newcolumntype' macro
\newcolumntype{C}{>{{}}c<{{}}} % for binary and relational operators
\newcolumntype{L}{>{\displaystyle}L} % automatic display-style math mode, left-aligned
\renewcommand\arraystretch{1.2} % to emulate vert. spacing of 'align' env.
\begin{array}{LCLCLCLl} % the final column is a "dummy" column
  a &=& b &+& c &+& d\\
  b &=& b &+& c &+& d\\
  c &=& b &+& c &+& d\\
  aoeu &=& \multicolumn{6}{l}{\mbox{something long here}}
|improve this answer|||||
  • 2
    I'd add the local setting \renewcommand{\arraystretch}{1.2} to better emulate align*. – egreg May 18 '18 at 20:21
  • 1
    @egreg - Many thanks for the suggestion. I took it on board right away. :-) – Mico May 18 '18 at 20:37

As I don't know the real stuff that will be in your alignat* environment, I kept the three alignment columns. A solution consists in putting the r.h.s. of the last row in an \rlap command, which makes it have 0 width. In case this r.h.s. were a maths formula, mathtools defines a \mathrlap command, which has the same effect in math mode:




  a &= b &{}+{}& c &{}+{}& d\\
  b &= b &{}+{}& c &{}+{}& d\\
  c &= b &{}+{}& c &{}+{}& d\\
  aoeu &= \rlap{something long here}\\
 a & =\mathrlap{\frac{-b\pm\sqrt{b^2-4ac}}{2a}}


enter image description here

|improve this answer|||||
  • you lose the \mathbin spacing of + with &+& – David Carlisle May 18 '18 at 19:31
  • @DavidCarlisle: Oh! yes. I didn't notice it as I focused on the extra spacing. I'll fix that in a moment. Thanks for pointing it! – Bernard May 18 '18 at 19:53
  • You lose the proper centering. – egreg May 18 '18 at 20:21
  • @egreg: That's right with the present code. With the real code, I don't know: either it may be unimportant (e.g. one wants to have only the significant part of the alignment centred, or it will be compensated by some formula.In each case, I think it's a matter of lavorazione a mano. – Bernard May 18 '18 at 20:36

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.