WhoCites Definitions hol list 2 Sections HOLlib Doc
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Who Cites length?
lengthDef ||as|| == Case of as; nil  0 ; a.as'  ||as'||+1  (recursive)
Thm* A:Type, l:A List. ||l||  
Thm* ||nil||  
Thm* 'a:Type, l:'a List. ||l||  

Syntax:||as|| has structure: length(as)

About:
listlist_indint
natural_numberaddrecursive_def_noticeuniversememberall
!abstraction
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WhoCites Definitions hol list 2 Sections HOLlib Doc