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Proof step 2 from proof eq-one (previous step)

2 ^ i = 1 ⊦ i = 0

User applied rule cut formula

And obtained the following new goals

Proof step 3:
1 = 2 ^ 0, 2 ^ i = 1 ⊦ i = 0

Rule argument

fma: 1 = 2 ^ 0

Additional information

Used formulas: 1 = 2 ^ 0