Section Tarski_is_a_Coinc_theory_for_col.
Context `{TnEQD:Tarski_neutral_dimensionless_with_decidable_point_equality}.
Definition diff : arity Tpoint 2 := fun A B : Tpoint => A <> B.
Definition col : arity Tpoint 3 := Col.

Lemma col_bd : forall A (X : cartesianPower Tpoint 1), app_2_n col A A X.