IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html
At:
append split2111 1. T : Type
2. L : T List
3. P : ||L||Prop
4. x:||L||. Dec(P(x))
5. i,j:||L||. P(i) i<jP(j)
6. i : ||L||
7. P(i)
8. j:i. P(j)
L = (firstn(i;L) @ nth_tl(i;L))
By:
Symmetry
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