- â\88\80b,f,I,K2. ð\9d\90\94â¦\83fâ¦\84 â\86\92 â¬\87*[b,f] L2 ≘ K2.ⓘ{I} →
- â\88¨â\88¨ â\88\83â\88\83K1. K1 â«\83 K2 & â¬\87*[b,f] L1 ≘ K1.ⓘ{I}
- | â\88\83â\88\83K1,W,V. K1 â«\83 K2 & â¬\87*[b,f] L1 ≘ K1.ⓓⓝW.V & I = BPair Abst W
- | â\88\83â\88\83J1,J2,K1,V. K1 â«\83 K2 & â¬\87*[b,f] L1 ≘ K1.ⓑ{J1}V & I = BUnit J2.
+ â\88\80b,f,I,K2. ð\9d\90\94â¦\83fâ¦\84 â\86\92 â\87©*[b,f] L2 ≘ K2.ⓘ{I} →
+ â\88¨â\88¨ â\88\83â\88\83K1. K1 â«\83 K2 & â\87©*[b,f] L1 ≘ K1.ⓘ{I}
+ | â\88\83â\88\83K1,W,V. K1 â«\83 K2 & â\87©*[b,f] L1 ≘ K1.ⓓⓝW.V & I = BPair Abst W
+ | â\88\83â\88\83J1,J2,K1,V. K1 â«\83 K2 & â\87©*[b,f] L1 ≘ K1.ⓑ{J1}V & I = BUnit J2.