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Proof step 2 from proof ls-null (previous step)

x = a + x0 ⊦ ls(null, x) = (emp ∧ ⌜x = []⌝ )

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
⊦ _∃(λ r. false) = false

Rule argument

Additional information

Used simplifier rules: ls-rec: ⊦ ls(r, a ' + x) = _∃(λ r0. r => a × r0 * ls(r0, x));%and-com: ⊦ (P0 ∧ P1) = (P1 ∧ P0); from specification heap-sep%and-ass: ⊦ ((P0 ∧ P1) ∧ P2) = (P0 ∧ P1 ∧ P2); from specification heap-sep% ⊦ (false ∧ P) = false; (s)% ⊦ a ' + x ≠ []; (s)%a: ⊦ (x + y) + z = x + y + z; from specification list%sep-com: ⊦ P0 * P1 = P1 * P0; from specification heap-sep%sep-ass: ⊦ (P0 * P1) * P2 = P0 * P1 * P2; from specification heap-sep% ⊦ false * P = false; (s)% ⊦ ⌜false⌝ = false; (s)% ⊦ null => ce = ⌜false⌝ ; (s)% ⊦ a + x = a ' + x; (s)