bs ; a.as' a.(as' @ bs) (recursive)
T:Type, as,bs:T List. (as @ bs) 
T List| Who Cites append? | |
| append | Def as @ bs == Case of as; nil bs ; a.as' a.(as' @ bs) (recursive) |
| Thm* T:Type, as,bs:T List. (as @ bs) T List |
| Syntax: | as @ bs | has structure: | append(as; bs) |
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