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Proof step 1 from proof square-zero-01 (conclusion) (back to tree)

⊦ 0.r ≤ r → ¬ (r + 1.r) * (r + 2.r) ≤ 0.r

System applied rule normalize

And obtained the following new goals

Rule argument

Additional information

Proof step 2 from proof square-zero-01 (previous step) (back to tree)

0.r ≤ r, (r + 1.r) * (r + 2.r) ≤ 0.r ⊦

User applied rule apply rewrite lemma

And obtained the following new goals

Rule argument

spec: <toplevel>, name: two-def, seq: ⊦ 2.r = 1.r + 1.r, subst:, <all paths>

Additional information

Used terms:

Proof step 3 from proof square-zero-01 (previous step) (back to tree)

⊦ 2.r = 1.r + 1.r

Lemma two-def

Proof step 4 from proof square-zero-01 (previous step) (back to tree)

0.r ≤ r, (r + 1.r) * (r + 1.r + 1.r) ≤ 0.r ⊦

User applied rule apply rewrite lemma

And obtained the following new goals

Rule argument

spec: <toplevel>, name: zero-le-02, seq: ⊦ 0.r ≤ r → (r * r0 ≤ 0.r ↔ r = 0.r ∨ r0 ≤ 0.r), subst:[r, r0] → [r + 1.r, r + 1.r + 1.r], <all paths>

Additional information

Used simplifier rules: distr: ⊦ r * (r0 + r1) = r * r0 + r * r1; mult-one: ⊦ 1.r * r = r; mult-ass: ⊦ (r * r0) * r1 = r * r0 * r1; mult-com: ⊦ r * r0 = r0 * r; ⊦ (* i).r + (* j).r = (i + j).r; (s) add-a: ⊦ i + j + i0 = (i + j) + i0; from specification int-basic2 add-c: ⊦ i + j = j + i; from specification int-basic2 mone-03: ⊦ r + 1.r = 0.r → r < 0.r; (forward) from specification real-basic ⊦ r ≤ r0 → ¬ r0 < r; (s) ⊦ r ≠ r0 → (r ≤ r0 ↔ r < r0); (s) forward-lels: ⊦ r ≤ r0 ∧ r0 < r1 → r < r1; (forward) from specification real-abs forward-lele: ⊦ r ≤ r0 ∧ r0 ≤ r1 → r ≤ r1; (forward) from specification real-abs ⊦ j < i → ((* i).r + r0 < (* j).r + r1 ↔ (i - j).r + r0 < r1); (s) ⊦ r + r0 < r0 ↔ r < 0.r; (s) ⊦ i.r < j.r ↔ i < j; (s) add-assoc: ⊦ (r + r0) + r1 = r + r0 + r1; from specification real-basic add-comm: ⊦ r + r0 = r0 + r; from specification real-basic ⊦ r ≤ r0 ↔ ¬ r0 < r; (ss) forward-lsle: ⊦ r < r0 ∧ r0 ≤ r1 → r < r1; (forward) from specification real-abs Used terms: r + 1.r, r + 1.r + 1.r

Proof step 5 from proof square-zero-01 (previous step) (back to tree)

⊦ 0.r ≤ r → (r * r0 ≤ 0.r ↔ r = 0.r ∨ r0 ≤ 0.r)

Lemma zero-le-02

Proof Tree for square-zero-01 (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