Section Fprop_relative_FLX.
Variable prec : Z.
Variable Hp : Z.lt 0 prec.
Variable rnd : R -> Z.
Context { valid_rnd : Valid_rnd rnd }.

Theorem relative_error_FLX :
forall x,
(x <> 0)%R ->
(Rabs (round beta (FLX_exp prec) rnd x - x) < bpow (-prec + 1) * Rabs x)%R.