eolas/neuron/8f51653f-9574-4f79-81a8-1f2ecc0ba592/Biconditional_Introduction.md
2025-01-01 15:57:56 +00:00

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tags:
- logic
---
# Biconditional introduction
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.
![](static/bi-intro.png)