Nuprl - Some Definitions

auto_lang	`Def LangOf(DA)(l) == DA(l)` `Thm* Alph,St:Type, A:Automata(Alph;St). LangOf(A) LangOver(Alph)`
accept_list	`Def DA(l) == FinalState(DA)(Result(DA)l)` `Thm* Alph,St:Type, A:Automata(Alph;St), l:Alph*. A(l)`
assert	`Def b == if b True else False fi` `Thm* b:. b Prop`
compute_list	`Def Result(DA)l == if null(l) InitialState(DA) else DA((Result(DA)tl(l)),hd(l)) fi (recursive)` `Thm* Alph,St:Type, A:Automata(Alph;St), l:Alph*. (Result(A)l) St`
DA_fin	`Def FinalState(a) == 2of(2of(a))` `Thm* Alph,States:Type, a:Automata(Alph;States). FinalState(a) States`
hd	`Def hd(l) == Case of l; nil "?" ; h.t h` `Thm* A:Type, l:A*. \|\|l\|\|1 hd(l) A`
tl	`Def tl(l) == Case of l; nil nil ; h.t t` `Thm* A:Type, l:A. tl(l) A`
DA_act	`Def a == 1of(a)` `Thm* Alph,States:Type, a:Automata(Alph;States). a StatesAlphStates`
DA_init	`Def InitialState(a) == 1of(2of(a))` `Thm* Alph,States:Type, a:Automata(Alph;States). InitialState(a) States`
null	`Def null(as) == Case of as; nil true ; a.as' false Thm* T:Type, as:T. null(as)` `Thm null(nil)`
pi2	`Def 2of(t) == t.2` `Thm* A:Type, B:(AType), p:a:AB(a). 2of(p) B(1of(p))`
pi1	`Def 1of(t) == t.1` `Thm* A:Type, B:(AType), p:a:AB(a). 1of(p) A`

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