Explain why the rule looks different

parent c3e98412
......@@ -67,6 +67,12 @@ from timeless propositions even when working under the later modality:
\infer{\timeless{\prop} \and \prop \proves \later \propB}
{\later\prop \proves \later\propB}
This rule looks different from the above ones, because we still do not have that
{\later\prop \proves \prop}
The following rules can be derived about except-0:
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