⊦ R0 = R1 ↔ (∀ rs, f, g. R0[rs, f, g] ↔ R1[rs, f, g])
⊦ ∀ rs, f, g. a[P0 ∧ P1][rs, f, g] ↔ (a[P0] ∧ a[P1])[rs, f, g]
Used terms: a[P0] ∧ a[P1], a[P0 ∧ P1]