fact: Definition bound_var (v : positive) : Formula Z := Build_Formula (PEX v) OpGe (PEc 0).
imports: List Bool OrderedRing RingMicromega ZCoeff Refl ZArith_base ZArithRing Ztac EnvRing Coq.micromega.Tauto BinNums Zdiv Znumtheory QArith Znumtheory