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Proof step 14 from proof range-eq-validtrailer (previous step)

subarray(mkempbuf(n), n0, NODE_HEADER_SIZE) = validtrailer, is-aligned(n0, NODE_HEADER_SIZE), is-aligned(# buf, NODE_HEADER_SIZE), n0 + NODE_HEADER_SIZE ≤ n ⊦ n = 0, isempty(validtrailer)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 15:
⊦ isempty(buf) ↔ isempty(buf, 0, # buf)
Proof step 16:
subarray(mkempbuf(n), n0, NODE_HEADER_SIZE) = validtrailer, is-aligned(# buf, NODE_HEADER_SIZE), is-aligned(n0, NODE_HEADER_SIZE), n0 + NODE_HEADER_SIZE ≤ n ⊦ n = 0, isempty(validtrailer, 0, # validtrailer)

Rule argument

spec: eraseblock name: isempty seq: ⊦ isempty(buf) ↔ isempty(buf, 0, # buf) subst: [buf] → [validtrailer] flags: <all paths>

Additional information

Used terms: validtrailer