(* *)
(**************************************************************************)
+include "Q/q/q.ma".
include "Q/q.ma".
+include "Q/fraction/finv.ma".
-alias id "finv" = "cic:/matita/Q/fraction/finv/finv.con".
theorem denominator_integral_factor_finv:
∀f. enumerator_integral_fraction f = denominator_integral_fraction (finv f).
intro;
elim z; simplify; reflexivity]
qed.
-alias id "Qpos" = "cic:/matita/Q/q/q/Q.ind#xpointer(1/1/2)".
definition is_positive ≝
λq.
match q with
| _ ⇒ False
].
-alias id "Qneg" = "cic:/matita/Q/q/q/Q.ind#xpointer(1/1/3)".
definition is_negative ≝
λq.
match q with