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Proof step 6 from proof isprefix-eq-size-app-eq (previous step)

# x0 = # x1 + # x2, x0 + z = x1 + x2 ⊦ x0 = x1 + x2

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 7:
⊦ x = y ↔ # x = # y ∧ (∀ n. n < # x → x[n] = y[n])
Proof step 8:
# x0 = # x1 + # x2, x0 + z = x1 + x2 ⊦ # x0 = #(x1 + x2) ∧ (∀ n. n < # x0 → x0[n] = (x1 + x2)[n])

Rule argument

spec: list-del name: extension seq: ⊦ x = y ↔ # x = # y ∧ (∀ n. n < # x → x[n] = y[n]) subst: [y, x] → [x1 + x2, x0] flags: <all paths>

Additional information

Used terms: x1 + x2, x0