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Proof step 19 from proof charn9 (previous step)

⊦ 4 = pos('9', '5' ' + '6' ' + '7' ' + '8' ' + '9' ')

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 20:
⊦ char ≠ char0 → pos(char, char0 ' + chars) = pos(char, chars) + 1
Proof step 21:
'9' ≠ '5' ⊦ 4 = pos('9', '6' ' + '7' ' + '8' ' + '9' ') + 1

Rule argument

spec: list-del inst: charlist name: pos-n seq: ⊦ char ≠ char0 → pos(char, char0 ' + chars) = pos(char, chars) + 1 subst: [chars, char0, char] → ['6' ' + '7' ' + '8' ' + '9' ', '5', '9'] flags: rewrite

Additional information

Used terms: '6' ' + '7' ' + '8' ' + '9' ', '5', '9'