signature fracLib =
sig
        type term = Term.term
        type thm = Thm.thm
        type goal = Abbrev.goal
        type conv = Abbrev.conv
        type tactic = Abbrev.tactic
        type simpset = simpLib.simpset

        (* equivalence *)
        val FRAC_EQ_CONV : conv
        val FRAC_NOTEQ_CONV : conv
        val FRAC_EQ_TAC : tactic

        (* positive and non-zero *)
        val FRAC_POS_CONV : conv
        val FRAC_NOT0_CONV : conv
        val FRAC_POS_TAC : term -> tactic
        val FRAC_NOT0_TAC : term -> tactic

        (* numerator and denominator extraction *)
        val FRAC_NMR_CONV : conv
        val FRAC_DNM_CONV : conv
        val FRAC_NMRDNM_TAC : tactic

        (* calculation *)
        val FRAC_CALC_CONV : conv
        val FRAC_STRICT_CALC_TAC : tactic
        val FRAC_CALCTERM_TAC : term -> tactic
        val FRAC_CALC_TAC : tactic

        val FRAC_STRICT_CALCEQ_TAC : tactic
        val FRAC_CALCEQ_TAC : tactic

        val FRAC_SAVE_CONV : conv
        val FRAC_SAVE_TAC : tactic

end