Library Coq.QArith.QOrderedType
DecidableType structure for rational numbers
eq_refl, eq_sym, eq_trans
eq_dec
Note that the last module fulfills by subtyping many other
interfaces, such as DecidableType or EqualityType.
OrderedType structure for rational numbers
An order tactic for Q numbers
Note that q_order is domain-agnostic: it will not prove
1<=2 or x<=x+x, but rather things like x<=y -> y<=x -> x==y.