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I have noticed that the environment align appears to do everything that the environment equation accomplishes, plus the additional features of aligning equations and arranging them in an organized manner on the page.

I have started writing up some lecture notes and have noticed that I use align so often that I now use it in place of equation!

Are there any reasons why I should not do this? ie; why I would want to use the equation environment when I don't need all the features of align? or is it acceptable to use align throughout my document?

user3728501
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    in short equation has some space saving features that align does not. Thus if you know what to look for you'll often be able to see when an author has been using align for one-liners. – daleif Oct 10 '16 at 14:11
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    you shouldn't use align if there is only one equation, and more generally you shouldn't use it if there are no alignment points (necessarily the case if there is only one equation) – David Carlisle Oct 10 '16 at 14:57
  • Personaly, I use equation with one equation, align (align) with several equations with an alignment position and gather (gather) with sveral equations, formulas to be centered. Allowdisplaybreak takes care of page skips efficiently. – pzorba75 Oct 10 '16 at 15:39
  • @pzorba75 I'm not aware of the gather environment. How does this differ from align? – user3728501 Oct 10 '16 at 15:42
  • see texdoc amsmath gather is for multiple equations with no alignment, also multline which is for a single but multi-line equation with no alignment – David Carlisle Oct 10 '16 at 15:45

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