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Proof step 4 from proof decode-contract (previous step)

n = EB_PAGE_SIZE, ENCODED_ELEM_SIZE ≤ n, EB_PAGE_SIZE ≤ # buf ⊦ ⟪decode_nonempty#(0, buf; a; err)⟫ ((err = ESUCCESS ∨ ⌊err⌋ ) ∧ (err = ESUCCESS → is-encoded-pagesize(a, subarray(buf, 0, EB_PAGE_SIZE))))

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 5:
EB_PAGE_SIZE ≤ # buf, ENCODED_ELEM_SIZE ≤ EB_PAGE_SIZE, ENCODED_ELEM_SIZE ≤ # buf ⊦ ⟪decode_nonempty#(0, buf; a; err)⟫ ((err = ESUCCESS ∨ ⌊err⌋ ) ∧ (err = ESUCCESS → is-encoded-pagesize(a, subarray(buf, 0, EB_PAGE_SIZE))))

Rule argument

Additional information

Used simplifier rules: let: ⊦ n ≤ n0 ∧ n0 ≤ n1 → n ≤ n1; (forward) from specification nat