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Proof step 3 from proof is-encoded-vidheader-emptypage (previous step)

is-encoded(vhdr, emptypage) ⊦

User applied rule apply lemma

And obtained the following new goals

Proof step 4:
⊦ is-encoded-nonempty(vhdr, buf) ↔ is-encoded-empty(vhdr, buf) ∧ ¬ isempty(buf)
Proof step 5:
is-encoded-nonempty(vhdr, emptypage) ↔ is-encoded-empty(vhdr, emptypage) ∧ ¬ isempty(emptypage), is-encoded(vhdr, emptypage) ⊦

Rule argument

spec: encoding-fixed-size-nonempty, inst: encoding-vidheader name: is-encoded-nonempty seq: ⊦ is-encoded-nonempty(vhdr, buf) ↔ is-encoded-empty(vhdr, buf) ∧ ¬ isempty(buf) subst: [vhdr, buf] → [vhdr, emptypage]

Additional information

Used terms: vhdr, emptypage