namespace System
{
    [RequiresPreviewFeatures("Generic Math is in preview.", Url = "https://aka.ms/dotnet-warnings/generic-math-preview")]
    public interface IMultiplicativeIdentity<TSelf, TResult>
        where TSelf, IMultiplicativeIdentity<TSelf, TResult>!
    {
        static TResult MultiplicativeIdentity { get; }
    }
}