Aligning mathematical "equations"

Question

I am trying to get the following output (this is just written using Google Docs):

I find that align* doesn't work here as there is no = present. Further, I would like this to be centralised, so I have not tried using flalign* (as my understanding is that flalign* can only be used to align equations to the left-hand-side).
Any assistance would be much appreciated.

Werner · Accepted Answer

You can use an align, even without =.

documentclass{article}

usepackage{amsmath}

begin{document}

begin{align*}
              & gcd(a, b) ,|, a text{ and } b 
  Rightarrow & gcd(a, b) ,|, ax + by 
  Rightarrow & gcd(a, b) ,|, d
end{align*}

end{document}

thisismetrying · Answer

These lines can be produced using the "eqnarray"-environment:
begin{eqnarray*}
   gcd(a,b) &|& a and b
 =>gcd(a,b) &|& ax + by
 =>gcd(a,b) &|& d
end{eqnarray*}

Use the asterix (*) to suppress the numbering of the equations and the sign "&" on both of the sign which you want to center around.

Xandria · Answer

Using align like this should be working:
documentclass{article}
usepackage{amsmath}
begin{document}
begin{align*}
  & gcd(a,b) mid a  and  b 
 Rightarrow & gcd(a,b) mid ax + by 
 Rightarrow & gcd(a,b) mid d
end{align*}
end{document}

When I compile it, it is well centered and looks like your picture.
Hope this helps

Bernard · Answer

It does work. Align the  | symbol:
documentclass{article}
usepackage{amsmath}

begin{document}

begin{align*}
gcd(a, b) & mid a, b 
implies gcd(a, b) & mid ax + by 
implies gcd(a, b) & mid d
end{align*}

end{document}

Aligning mathematical "equations"

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