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Proof step 25 from proof mapex-new (previous step)

H ++ r = (∅ ++ r)[r, o] ∪ H0, P(H0) ⊦ r = null, P(H), r ∈ H, r ∈ H0

User applied rule cut formula

And obtained the following new goals

Proof step 26:
H ++ r = (∅ ++ r)[r, o] ∪ H0, P(H0) ⊦ H = H0, r = null, P(H), r ∈ H0, r ∈ H

Rule argument

fma: H = H0

Additional information

Used formulas: H = H0