At: rel mng lemma 1 2 1 2 1 1 1
1. ds: Collection(dec())
2. da: Collection(dec())
3. de: sig()
4. rho: Decl
5. st1: Collection(SimpleType)
6. e1: {1of([[de]] rho)}
7. s: {[[ds]] rho}
8. a: [[st1]] rho
9. tr: trace_env([[da]] rho)
10. l: Term List
11. u: Term
12. v: Term List
13. 
i:
(||v||+1). trace_consistent(rho;da;tr.proj;[u / v][i])
14. ls: SimpleType List
15. f: reduce(
s,m. [[s]] rho
m;Prop;ls)
16. ||ls|| = ||v||+1 
17. i:. i < ||v||+1 
ls[i] term_types(ds;st1;de;[u / v][i])
18. ls:SimpleType List, f:reduce(s,m. [[s]] rhom;Prop;ls).
||ls|| = ||v|| & (i:. i < ||v|| ls[i] term_types(ds;st1;de;v[i]))
list_accum(x,t.x([[t]] e1 s a tr);f;v) Prop
19. f:reduce(s,m. [[s]] rhom;Prop;tl(ls)).
||tl(ls)|| = ||v|| & (i:. i < ||v|| tl(ls)[i] term_types(ds;st1;de;v[i]))
list_accum(x,t.x([[t]] e1 s a tr);f;v) Prop
ls ~ [hd(ls) / tl(ls)]
By: BackThru
Thm* L:T List. 0 < ||L|| (L ~ [hd(L) / tl(L)])
Generated subgoals:None
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