fact: Definition trace_order A (t: trace A) e e' := trace_nodup t /\ (exists i j, i < j /\ NOmega.lt_nat_l j (trace_length t) /\ trace_nth i t e = e /\ trace_nth j t e = e').
imports: HahnBase HahnList HahnSets HahnRelationsBasic HahnOmega HahnWf Arith micromega.Lia IndefiniteDescription