fact: Hypothesis HER3 : forall x1 x2 y1 y2, x1 == x2 -> y1 == y2 -> i_less x1 y1 -> i_less x2 y2.
imports: Lia Arith Undecidability.PCP.PCP Undecidability.PCP.Util.PCP_facts Undecidability.Synthetic.DecidabilityFacts Undecidability(FOL.Utils.FullSyntax) Undecidability(FOL.FSAT) Undecidability.Shared.ListAutomation