Require Export GeoCoq.Elements.OriginalProofs.lemma_equalitysymmetric.
Section Euclid.
Context `{Ax:euclidean_neutral}.

(* Specifications: *)
Lemma lemma_inequalitysymmetric :
forall A B,
neq A B ->
neq B A.
Lemma lemma_collinear1 :
forall A B C,
Col A B C ->
Col B A C.
Lemma lemma_collinear2 :
forall A B C,
Col A B C ->
Col B C A.