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I wanna write the sequence $L \underset{\beta_1} \leftrightarrows \overset{ \alpha_1} M \underset{\alpha_2} \leftrightarrows \overset{ \beta_2} N$

with the map \alpha_1 above the arrows and \beta_1 below the arrows, same goes for \alpha_2 and \beta_2.

Any help please?

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@NicholasHamilton If you could please write my code in latex, you'd get exactly what I'm talking about :) – Selena May 4 '14 at 7:53
up vote 2 down vote accepted

You can use:

   $L \underset{\beta_1}{\overset{ \alpha_1} \leftrightarrow}  M
    \underset{\alpha_2}{\overset{ \beta_2} \leftrightarrow}  N$

enter image description here

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You may want to use \longleftrightarrow instead of \leftrightarrow. – Mico May 4 '14 at 8:00

You can use the mathtools package's extensible arrows:

L \xleftrightarrow[\beta_1]{\alpha_1} M \xleftrightarrow[\alpha_2]{\beta_2} N
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