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Proof step 5 from proof int2bytes-len-eq-neg (previous step)

¬ # int2bytes(i) < n ↔ i + 2 ^ (8 * (n→i(n) - 1)) < 0, i < 0 ⊦ int2bytes(i).first = i2b(~1), # int2bytes(i) = n ↔ ¬ 2 ^ (8 * n→i(n)) + i < 0 ∧ ¬ 0 ≤ i + 2 ^ (8 * (n→i(n) - 1)) ∧ n ≠ 0

User applied rule insert lemma

And obtained the following new goals

Proof step 6:
⊦ i < 0 ∧ int2bytes(i).first ≠ i2b(~1) → (# int2bytes(i) ≤ n ↔ ~(2 ^ (8 * n→i(n))) ≤ i)
Proof step 7:
i < 0 ∧ int2bytes(i).first ≠ i2b(~1) → (# int2bytes(i) ≤ n ↔ ~(2 ^ (8 * n→i(n))) ≤ i), ¬ # int2bytes(i) < n ↔ i + 2 ^ (8 * (n→i(n) - 1)) < 0, i < 0 ⊦ int2bytes(i).first = i2b(~1), # int2bytes(i) = n ↔ ¬ 2 ^ (8 * n→i(n)) + i < 0 ∧ ¬ 0 ≤ i + 2 ^ (8 * (n→i(n) - 1)) ∧ n ≠ 0

Rule argument

name: int2bytes-len-le-neg-02 subst: [i, n] → [i, n]

Additional information

Used terms: i, n