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How to include these symbols in equation? I'm unable to find these

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  • sorry sir i didnt get you, i need equation as the image included i did it in mathtype
    – Prasad
    Sep 26 '16 at 14:29
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The symbol you are searching for if \leftrightarrows or \rightleftarrows :

$a \overset{k}{\leftrightarrows} b$

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