(7steps total) PrintForm Definitions Lemmas mb event system 1 Sections EventSystems Doc
IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html
At: general length nth tl 2 1

1. r : 
2. 0<r
3. L:Top List. ||nth_tl(r-1;L)|| = if r-1<||L|| ||L||-(r-1) else 0 fi
4. L : Top List
5. 0<r
6. r<||L||
  ||nth_tl(r-1;tl(L))|| = ||L||-r  


By: InstHyp [tl(L)] 3 THEN RWO Thm* l:A List. ||l|| ||tl(l)|| = ||l||-1   -1
THEN
MoveToConcl -1
THEN
SplitOnConclITE


Generated subgoals:

None

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

(7steps total) PrintForm Definitions Lemmas mb event system 1 Sections EventSystems Doc