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Proof step 1 from proof numhex-rec (conclusion)
str ≠ "" ⊦ hex((* str)) = hexchar(str.char1) * 16 ^ (n→i(# str) - 1) + hex(str.rstring)
Special step normalize
And obtained the following new goals
Proof step 2
:
str ≠ "" ⊦ hex(str) = hexchar(str.char1) * 16 ^ (n→i(# str) - 1) + hex(str.rstring)