IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html
At:
firstn is iseg21 1. T : Type
2. L1 : T List
3. L2 : T List
4. n : (||L2||+1)
5. L1 = firstn(n;L2)
L2 = (L1 @ nth_tl(n;L2))
By:
Symmetry THEN HypSubst -1 0
THEN
BackThru Thm*L:T List, n:{0...||L||}. (firstn(n;L) @ nth_tl(n;L)) = L
Generated subgoals:
None
About:
IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html
(||L2||+1)
L2 = (L1 @ nth_tl(n;L2))
L:T List, n:{0...||L||}. (firstn(n;L) @ nth_tl(n;L)) = L
