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Proof step 3 from proof isexpath (previous step)

ispath(p, n, m, dirs, files) ⊦ ispath(p, n, dirs, files)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 4:
⊦ ispath(p, n, dirs, files) ↔ (∃ m. ispath(p, n, m, dirs, files))
Proof step 5:
ispath(p, n, m, dirs, files) ⊦ ∃ m. ispath(p, n, m, dirs, files)

Rule argument

spec: <toplevel> name: expath seq: ⊦ ispath(p, n, dirs, files) ↔ (∃ m. ispath(p, n, m, dirs, files)) subst: [files, dirs, n, p] → [files, dirs, n, p] flags: <all paths>

Additional information

Used terms: files, dirs, n, p