ExcludeFromCodeCoverageAttribute.cs

 using System.Reactive.Observable.Aliases;

// filter will invoke where
Observable.Range(0, 10).Filter(i => i % 2 == 0);
Observable.Range(0, 10).Where(i => i % 2 == 0);

// map will invoke select
Observable.Range(0, 10).Map(i => $"- {i} -");
Observable.Range(0, 10).Select(i => $"- {i} -");

// flat-map will invoke select-many
Observable.Range(0, 10).FlatMap(i => Observable.Range(i, 3));
Observable.Range(0, 10).SelectMany(i => Observable.Range(i, 3));