- â\88\80T1,T0. â\87§*[des0] T1 ≡ T0 →
- â\88\80T2. â\87§[O, i0 + 1] T0 ≡ T2 →
- â\88\83â\88\83T. â\87§[0, i + 1] T1 â\89¡ T & â\87§*[des] T ≡ T2.
+ â\88\80T1,T0. â¬\86*[des0] T1 ≡ T0 →
+ â\88\80T2. â¬\86[O, i0 + 1] T0 ≡ T2 →
+ â\88\83â\88\83T. â¬\86[0, i + 1] T1 â\89¡ T & â¬\86*[des] T ≡ T2.