eolas/zk/Biconditional_Introduction.md

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---
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categories:
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- Logic
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tags: []
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---
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# Biconditional introduction
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The biconditional means if $P$ is the case, $Q$ must be the case and if $Q$ is
the case, $P$ must be the case. Thus to introduce this operator we must
demonstrate both that $Q$ follows from $P$ and that $P$ follows from $Q$. We do
this via two sub-proofs.
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![](/_img/bi-intro.png)