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At: firstn is iseg 1

1. T : Type
2. L1 : T List
3. L2 : T List
4. l : T List
5. L2 = (L1 @ l)
  n:(||L2||+1). L1 = firstn(n;L2)


By: ((HypSubst -1 0)
(THEN
((RWO Thm* as,bs:T List. ||as @ bs|| = ||as||+||bs||   0))
THEN
InstConcl [||L1||]


Generated subgoal:

1   L1 = firstn(||L1||;L1 @ l)
9 steps

About:
listintnatural_numberadduniverseequalallexists
IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html

(13steps total) PrintForm Definitions Lemmas mb list 1 Sections MarkB generic Doc