Static interface in C# 10.0

1.IMath.cs

public interface IMath
{
    static int Add(int x, int y) => x + y;
    abstract static int Sub(int x, int y);
    abstract static int Mul(int x, int y);
    abstract static int Div(int x, int y);
}

2.Math.cs

internal class Math : IMath
{
    public static int Div(int x, int y) => x - y;
    public static int Mul(int x, int y) => x * y;
    public static int Sub(int x, int y) => x / y;
}

Program.cs

internal partial class Program
{
    public static void Main()
    {
        var sum = Add<Math>(5, 6);
        System.Console.WriteLine(sum);
        
        var sub = Sub<Math>(6, 5);
        System.Console.WriteLine(sub);
    }

    public static int Add<TMath>(int x, int y)
        where TMath : IMath => TMath.Add(x, y);
    
    public static int Sub<TMath>(int x, int y)
        where TMath : IMath => TMath.Sub(x, y);
}