-theorem drops_trans: â\88\80b1,f1,L1,L. â¬\87*[b1, f1] L1 ≘ L →
- â\88\80b2,f2,L2. â¬\87*[b2, f2] L ≘ L2 →
- â\88\80f. f1 â\8a\9a f2 â\89\98 f â\86\92 â¬\87*[b1â\88§b2, f] L1 ≘ L2.
+theorem drops_trans: â\88\80b1,f1,L1,L. â\87©*[b1,f1] L1 ≘ L →
+ â\88\80b2,f2,L2. â\87©*[b2,f2] L ≘ L2 →
+ â\88\80f. f1 â\8a\9a f2 â\89\98 f â\86\92 â\87©*[b1â\88§b2,f] L1 ≘ L2.