fact: Variable (R : Type) (Rzero Rone : R) (Rplus Rmult Rminus : R -> R -> R) (Ropp : R -> R) (R_is_ring : ring_theory Rzero Rone Rplus Rmult Rminus Ropp eq).
imports: Arith ZArith Undecidability.Shared.Libs.DLW.Utils(utils_tac gcd prime binomial sums)