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Proof step 1 from proof ls-null (conclusion)

⊦ ls(null, x) = (emp ∧ ⌜x = []⌝ )

User applied rule constructor cut

And obtained the following new goals

Proof step 2:
x = a + x0 ⊦ ls(null, x) = (emp ∧ ⌜x = []⌝ )

Rule argument

var: x

Additional information

Used simplifier rules: ls-base: ⊦ ls(r, []) = (emp ∧ ⌜r = null⌝ );%list freely generated by [], +;;% ⊦ ⌜true⌝ = true; (s)% ⊦ (true ∧ P) = P; (s)%and-ass: ⊦ ((P0 ∧ P1) ∧ P2) = (P0 ∧ P1 ∧ P2); from specification heap-sep%and-com: ⊦ (P0 ∧ P1) = (P1 ∧ P0); from specification heap-sep