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I'd like to know if it is possible switch between the leqno and reqno options in the same document keeping the numbering of the equations. Namely i use the reqno option (default for amsmath and the standard article class), but i want that some equations are numbered by the left side (as if I had relied the leqno option) and the others no.

I'd like a commands as \leqnomode and \reqnomode to change the position of \tag in anywhere of the document.

Is this possible?

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up vote 10 down vote accepted

Here you go:

enter image description here



  f(x) &= ax^2 + bx + c \\
  g(x) &= dx^2 + ex + f


  f(x) &= ax^2 + bx + c \\
  g(x) &= dx^2 + ex + f

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What are these \makeatletter and \makeatother? – Enthusiastic Student Oct 16 '14 at 16:04
@EnthusiasticStudent: They are required when using @ symbols in macros. See What do \makeatletter and \makeatother do? – Werner Oct 16 '14 at 16:41
Is there a similar way of doing this with equation environment? – Mappi Dec 13 '14 at 18:00
@Mappi: I can't see a way to achieve that right now. A work-around is to use align, even though it has only a single equation and doesn't require any form of alignment. – Werner Dec 13 '14 at 19:22
@Werner: I tried to use your code in a (long) document, and it suppresses the equation number instead of changing on which side it is written. Do you have any idea which packages might be incompatible? – Bernard Feb 15 at 12:24

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