我想在Coq中证明一个定理,并且我无法解决发生的问题。我试图解决: 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
我正在写OTTER输入文件,这是非常简单的: 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.
我得到这个输出搜索: given clause #1