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I am currently showing that $a=b\Leftrightarrow e=f$ by showing that $a=b\Leftrightarrow c=d\Leftrightarrow e=f$. The problem that I have is that the expressions $\{a,b,c,d,e,f\}$ are rather long and do not fit in a single line. I am currently writing this: \begin{gather} a=b\\ c=d\\ e=f \end{gather} But I am wondering whether I should instead write this: \begin{gather} a=b\Leftrightarrow\\ c=d\Leftrightarrow\\ e=f \end{gather} Or perhaps even this: \begin{gather} a=b\Leftrightarrow\\ \Leftrightarrow c=d\Leftrightarrow\\ \Leftrightarrow e=f \end{gather} Hence, how should I write $a=b\Leftrightarrow c=d\Leftrightarrow e=f$ if the expression does not fit a single line?

Thank you all in advanced for your time!

J.-E. Pin
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EoDmnFOr3q
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2 Answers2

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You can put labels on the three equations : $$a=b\,\,\,(1)$$ $$c=d\,\,\,(2)$$ $$e=f\,\,\,(3)$$ And then use $$(1)\Leftrightarrow (2)\Leftrightarrow (3).$$

SacAndSac
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I would probably write

$$ \begin{align*} a &= b \\ \iff c &= d \\ \iff e &= f \end{align*} $$

Usually arrows at the beginning of the line read most naturally, in my opinion. If you're asking about LaTeX, this is done with the "align" environment.

Pavan C.
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  • Thank you for your comment. Let me ask you something: why $\Longleftrightarrow$ rather than $\Leftrightarrow$? – EoDmnFOr3q Apr 03 '22 at 17:44
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    I just prefer and generally choose to use $\iff$ which is "\iff" in LaTeX, but you can also use $\Leftrightarrow$. – Pavan C. Apr 03 '22 at 22:22