Definitions mb list 1 Sections MarkB generic Doc
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Some definitions of interest.
iffDef P  Q == (P  Q) & (P  Q)
Thm* A,B:Prop. (A  B Prop
lengthDef ||as|| == Case of as; nil  0 ; a.as'  ||as'||+1  (recursive)
Thm* A:Type, l:A List. ||l||  
Thm* ||nil||  

About:
listnillist_indintnatural_numberadd
recursive_def_noticeuniversememberpropimpliesandall
!abstraction
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Definitions mb list 1 Sections MarkB generic Doc