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Proof step 3 from proof mapex-del (previous step)

((r =>_ * P))(mk(rs, f)) ⊦ P(mk(rs, f) -- r)

User applied rule apply lemma

And obtained the following new goals

Rule argument

spec: maplet name: mapex-del seq: ⊦ ((r =>_ * P))(H) → P(H -- r) subst: [r, P, H] → [r, P, mk(rs, f)]

Additional information

Used terms: r, P, mk(rs, f)