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Proof step 3 from proof isprefix-size (previous step)

# lax = # gndx, # lax2 + # gndx < # lax0, lax0 ⊑ lax2 + lax ⊦ lax0 = []

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 4:
⊦ lax ⊑ lax0 ↔ (∃ lax1. lax + lax1 = lax0)
Proof step 5:
# lax = # gndx, # lax2 + # gndx < # lax0, ∃ lax1. lax0 + lax1 = lax2 + lax ⊦ lax0 = []

Rule argument

spec: list-last, inst: laddress-list name: prefix seq: ⊦ lax ⊑ lax0 ↔ (∃ lax1. lax + lax1 = lax0) subst: [lax0, lax] → [lax2 + lax, lax0] flags: <all paths>

Additional information

Used terms: lax2 + lax, lax0