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Home > Latex > FAQ > Latex - FAQ > Latex symbol if and only if / equivalence

Sunday 13 December 2020 , by Nadir Soualem

All the versions of this article:

< français >

How to write if and only if symbol / equivalence in Latex ? In mathematics, if and only if (iff) is a biconditional logical connective between statements, where either both statements are true or both are false.
You do not have to use any package:
For a short if and only if, use \Leftrightarrow:
A $\Leftrightarrow$ B
For a long if and only if, use \Longleftrightarrow:
C $\Longleftrightarrow$ D

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Welcome to LaTeX Base, a web-based L
preview! Here are some things to try –
edit the document name above by typing in the input field
make changes to the body on the left and watch the preview update
include an image by url like this one
check the compiler output by clicking the log button
format a mathematical expression like
download the document as a pdf by selecting Export
(or by clicking the desktop download button)
export your work to Dropbox or Google Drive
import an existing document from your local computer
try using the vim or emacs keyboard shortcuts
Editing short documents online is free. View premium plans and pricing
https://latexbase.com/static/pricing
editing (online or offline) and a variety of other useful features. Thanks for
trying out our service and don’t hesitate to get in touch at support@latexbase.com!
Visit LaTeX Base from a desktop computer to edit LaTeX docs collaboratively!

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