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Proof step 1 from proof insperm-03 (conclusion) (back to tree)

⊦ perm(ins≤(a, x), y) ↔ perm(a + x, y)

System applied rule normalize

And obtained the following new goals

Rule argument

Additional information

Proof step 2 from proof insperm-03 (previous step) (back to tree)

¬(perm(ins≤(a, x), y) ↔ perm(a + x, y)) ⊦

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

Additional information

Used simplifier rules: ⊦ a + x = a ' + x; (s)

Proof step 3 from proof insperm-03 (previous step) (back to tree)

¬(perm(ins≤(a, x), y) ↔ perm(a ' + x, y)) ⊦

User applied rule apply lemma

And obtained the following new goals

Rule argument

spec: <toplevel>, name:insperm, seq: ⊦ perm(a ' + x, ins≤(a, x)), subst:[a, x] → [a, x]

Additional information

Used terms: a, x

Proof step 4 from proof insperm-03 (previous step) (back to tree)

⊦ perm(a ' + x, ins≤(a, x))

Lemma insperm

Proof step 5 from proof insperm-03 (previous step) (back to tree)

¬(perm(ins≤(a, x), y) ↔ perm(a ' + x, y)), perm(a ' + x, ins≤(a, x)) ⊦

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

Additional information

Used simplifier rules: ⊦ perm(x, x); (s) a: ⊦ (x + y) + z = x + y + z; from specification list ⊦ perm(x + y, x + z) ↔ perm(y, z); (s) sym-01: ⊦ perm(x, y) → perm(y, x); (forward) from specification list-perm trans: ⊦ perm(x, y) ∧ perm(y, z) → perm(x, z); (forward) from specification list-perm

Proof step 6 from proof insperm-03 (previous step) (back to tree)

¬(perm(ins≤(a, x), y) ↔ perm(a ' + x, y)), perm(a ' + x, ins≤(a, x)), perm(ins≤(a, x), a ' + x) ⊦

User applied rule case distinction

And closed the goal!

Rule argument

pos: left 1

Additional information

Used simplifier rules: trans: ⊦ perm(x, y) ∧ perm(y, z) → perm(x, z); (forward) from specification list-perm sym-01: ⊦ perm(x, y) → perm(y, x); (forward) from specification list-perm sym-02: ⊦ ¬ perm(x, y) → ¬ perm(y, x); (forward) from specification list-perm

Proof Tree for insperm-03 (View conclusion)

The following image shows the proof tree of sequent calculus. The proved goal is at the bottom. You can click on the nodes to view additional rules. See here for details on colors in a proof tree.

the proof tree