Balanced form representations are representations where for every positive digit formula_28, there exist a corresponding negative digit formula_29 such that formula_30. It follows that formula_31. Only odd bases can have balanced form representations, as when formula_31 then formula_33 will be an odd number. In balanced form, the negative digits formula_19 are usually denoted as positive digits with a bar over the digit, as formula_35 for formula_15. For example, the digit set of balanced ternary would be formula_37 with formula_38, formula_39, and formula_40. This convention is adopted in finite fields of odd prime order formula_41: