NF weak partition development: NominalAlphaRepairedBase001004Csb.

noncomputable def NFChoice.DirectNominalPrf.NominalAlphaWrappersRepaired.nominalDfCsb (x y : SemanticCore.Var) (A B : SemanticCore.Class) (dv_A_y : y ∉ A.fv) (dv_B_y : y ∉ B.fv) (dv_x_y : x ≠ y) : Nominal.NPrf (SemanticCore.Wff.classEq (Compiler.CompactSourceSyntax.synCsb A x B) (SemanticCore.Class.cab y (Compiler.CompactSourceSyntax.synWsbc A x (SemanticCore.Wff.classMem (SemanticCore.Class.cv y) B))))

Checked nominal proof certificate identified upstream as nominal_df_csb.

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