hol list 2 Sections HOLlib Doc
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Def x:AB(x) == x:AB(x)

is mentioned by

Thm* 'a:S, l:'a List, n:.
Thm* ||l|| = n+1    (h:'al':'a List. ||l'|| = n   & l = cons(hl'))
[length_cons_2]
Thm* 'a:S, l:'a List. l = nil  (t:'a List, h:'al = cons(ht))[list_cases]
Thm* 'b,'a:S, x:'bf:('b'a('a List)'b).
Thm* (fn1:(('a List)'b). 
Thm* (fn1(nil) = x & (h:'at:'a List. fn1(cons(ht)) = f(fn1(t),h,t)))
Thm* & (fn1,y:(('a List)'b).
Thm* & (fn1(nil) = x & (h:'at:'a List. fn1(cons(ht)) = f(fn1(t),h,t))
Thm* & (y(nil) = x
Thm* & (& (h:'at:'a List. y(cons(ht)) = f(y(t),h,t))
Thm* & (
Thm* & (fn1 = y)
[list_axiom]

In prior sections: core fun 1 int 2 hol hol bool hol prim rec hol restr binder

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hol list 2 Sections HOLlib Doc