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Proof step 5 from proof mapex-new (previous step)

P(H) ⊦ r = null, ((r => (H ++ r)[r] * P))(H ++ r), r ∈ H

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 6:
⊦ ((P0 * P1))(H) ↔ (∃ H0, H1. H0 ⊥ H1 ∧ H = H0 ∪ H1 ∧ P0(H0) ∧ P1(H1))
Proof step 7:
P(H) ⊦ r = null, r ∈ H, ∃ H0, H1. H0 ⊥ H1 ∧ H ++ r = H0 ∪ H1 ∧ ((r => (H ++ r)[r]))(H0) ∧ P(H1)

Rule argument

spec: heap-sep name: sep seq: ⊦ ((P0 * P1))(H) ↔ (∃ H0, H1. H0 ⊥ H1 ∧ H = H0 ∪ H1 ∧ P0(H0) ∧ P1(H1)) subst: [H, P1, P0] → [H ++ r, P, r => (H ++ r)[r]] flags: <all paths>

Additional information

Used terms: H ++ r, P, r => (H ++ r)[r]