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Proof step 1 from proof sel-fst (conclusion)

⊦ (i × j).1 = i

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 2:
⊦ i × j = encode(encode(encode(i), encode(j)))
Proof step 3:
⊦ encode(encode(encode(i), encode(j))).1 = i

Rule argument

spec: <toplevel> name: encode-pair seq: ⊦ i × j = encode(encode(encode(i), encode(j))) subst: [j, i] → [j, i] flags: <all paths>

Additional information

Used terms: j, i