spaver: a spatial verifier for S4u
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$\tau$ is a spatial term -
$p$ is a atomic proposition -
$\sqcap$ and$\sqcup$ denotes spatial \textit{intersection} and \textit{Union} -
$\mathbb{I}$ and$\mathbb{C}$ means spatial \textit{interior} and \textit{closure} -
$\sqsubseteq$ expresses the spatial subset relation -
$\neg$ ,$\wedge$ and$\vee$ are Boolean operators