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Proof step 9 from proof exnotempty (previous step)

a ∈ st, ∀ a0, d, st0. st ≠ st0[a0, d] ∨ a0 ∈ st0 ⊦

User applied rule cut formula

And obtained the following new goals

Proof step 10:
a ∈ st, a ∈ st, ∀ a0, d, st0. st ≠ st0[a0, d] ∨ a0 ∈ st0 ⊦

Rule argument

fma: a ∈ st

Additional information

Used formulas: a ∈ st