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At: append split2 1 1 1

1. T : Type
2. L : T List
3. P : ||L||Prop
4. x:||L||. Dec(P(x))
5. i,j:||L||. P(i i<j  P(j)
6. i : ||L||
7. P(i)
8. j:iP(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:
listdecidablenatural_numberless_thanapply
functionuniverseequalpropimplies
all
IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html

(20steps total) PrintForm Definitions Lemmas mb list 1 Sections MarkB generic Doc