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Size: a a a
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Definition oleg : prp := all a : N, ([a == 0]) and neg ([a == 0]).
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W oleg : Set = nat -> unit * (unit -> unit)
C oleg : Set = {_ : nat & (unit + unit)%type}
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Nat -> ((), ()->())
такую, чтобы для любой сигмы coleg : (n ** Either () ())
case snd coleg of
Left _ => fst coleg == 0
Right _ => fst coleg /= 0
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