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Proof step 2 from proof short-zero (previous step)

s2i(sho) = 0 ⊦ sho = i2s(0)

User applied rule insert equation

And closed the goal!

Rule argument

pos: left 1 flags: rotate, discard

Additional information

Used simplifier rules: isi: ⊦ i2s(s2i(sho)) = sho;