I was reading A New Introduction to Modal Logic, written by G.E. Hughes and M.J. Cresswell, book on modal logic and the author uses the forward slash {/}:
but I was unable to understand it.
So I ask: what does / mean in this situation?
2026-03-27 22:03:18.1774648998
What does "/" (forward slash) mean in this context?
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From context, it seems like $(3)[p \land q / p]$ means "Take statement (3), but substitute $p \land q$ for $p$."