我正在寫OTTER輸入文件,這是非常簡單的: set(auto).
formula_list(usable).
all x y ([Nipah(x) & Encephalitis(y)] -> Causes(x,y)).
exists x y (Nipah(x) & Encephalitis(y)).
end_of_list.
我得到這個輸出搜索: given clause #1
我想在Coq中證明一個定理,並且我無法解決發生的問題。我試圖解決: forall A B C: Prop, A\/(B\/C)->(A\/B)\/C.
Proof.
intros.
destruct H as [H1 | [H2 | H3 ]].
Case H1.
and in this last line I get the following error "Error: The re
Require Import ProofWeb.
Variables x y z a : D.
Variables p: D * D * D -> Prop.
Theorem letra_a : (all x, p(a,x,x) /\ (all x, (all y, (all z, p(x,y,z))) -> p(f(x),y,f(z)))) -> p(f(a),a,f(a)).
Pr