inf-mcs-notes/06-hml.tex
Zhengyi Chen c5232bc821 ...
2024-04-20 22:38:16 +01:00

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\documentclass[99-notes-packed.tex]{subfiles}
\begin{document}
\paragraph*{HML}
Let $\varphi, \psi$ be HML expressions:
\begin{equation*}
\varphi, \psi \Coloneqq
\top\ |\ \bot\ |\ \neg \varphi\ |\ \varphi \wedge \psi\ |\
\varphi \vee \psi \ |\ \langle A\rangle \Phi \ |\ [A] \Phi
\end{equation*}
where $\Phi$ denotes predicates.
We omit explanation of familiar syntactic elements from FOL. Besides them:
\begin{align*}
P \models [A]\Phi &\iff
\forall Q: (\exists a \in A: P \xrightarrow{a} Q) \implies (Q \models \Phi) \\
P \models \langle A\rangle \Phi &\iff
\exists Q: \exists a \in A: P \xrightarrow{a} Q \wedge Q \models \Phi
\end{align*}
\begin{example}[deadlock in HML]
Given set of all actions $A$, a process $P$ deadlocks if this holds:
\begin{equation*}
P \models [A]\bot
\end{equation*}
\end{example}
\end{document}