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This question already has answers here :
How to look up a symbol or identify a letter from a math alphabet or other character?
(18 answers)
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Isn't it \iff ?
– Ludovic C.
Aug 20 '13 at 20:28
Welcome to TeX.SX! Usually, we don't put a greeting or a “thank you” in our posts. While this might seem strange at first, it is not a sign of lack of politeness, but rather part of our trying to keep everything very concise. Accepting and upvoting answers is the preferred way here to say “thank you” to users who helped you.
– Mensch
Aug 20 '13 at 20:33
@LudovicC., no \iff is the symbol with two lines. I nedd the symbol with one line..!!
– mle
Aug 20 '13 at 20:35
@LudovicC. there is also a version without the think double arrow. It might seem redundant but for people working on mathematical logic its important to distinguish which ones are part of the formal language being developed and which ones are part of the meta-language proving the logic being developed in question.
– Charlie Parker
Nov 4 '18 at 3:51
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thanks.. but I use \biconditional and I have "Undefined control sequence"
– mle
Aug 20 '13 at 20:41
@Soviet: Then you have missed the line \let\biconditional\leftrightarrow .
– Heiko Oberdiek
Aug 20 '13 at 20:44
if I use \leftrightarrow it is ok..
– mle
Aug 20 '13 at 20:45
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The link you provided is now dead. If you have any other resource of the link then please update your answer.
– Christos Lytras
Jan 5 '20 at 11:50
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TeX - LaTeX Stack Exchange is a question and answer site for users of TeX, LaTeX, ConTeXt, and related typesetting systems. It only takes a minute to sign up.
In LaTeX the symbol for material implication is produced by $\to$ , but for biconditional ?
For \leftrightarrow you can define your own command, e.g. \biconditional :
\iff adds some extra space (from fontmath.ltx ):
The example also shows some other arrow variants.
You can use \Leftrightarrow or \Longleftrightarrow
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