private static Pair <T, Pair <Rational, Rational> > FindInterval <T>(Dictionary <T, Pair <Rational, Rational> > intervals, Rational q) where T : IEquatable <T>
{
foreach (var pair in intervals)
{
if (q >= pair.Value.First && q < pair.Value.Second)
{
return(new Pair <T, Pair <Rational, Rational> >(pair.Key, pair.Value));
}
}
throw new ArgumentException();
}