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Concurrent Systems/notes/14 Checking bisimilarity, an inference system.md

@@ -43,6 +43,10 @@ $P$ is in standard form if and only if $P \triangleq \sum_{i}\alpha_{i}P_{i}$ an
 **Base case:** $P \triangleq 0$. It suffices to consider $P' \triangleq 0$ and conclude reflexivity.
 **Inductive step:** we have to consider three cases.
 
+1. $P \triangleq P_{1}|P_{2}$. By induction, we have that $\exists P_{1}',P_{2}'$ in standard form such that $\vdash P_{1}=P_{1}'$ and $P_{2}=P_{2}'$.
+
+	By context closure, $\vdash P_{1}|P_{2}=P_{1}'|P_{2}$ and $\vdash P_{1}'|P_{2}=P_{1}'|P_{2}'$
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