What's the Greek Idea of Tragedy?

I think that both oems were written by by one person. In the breadth of his vision, homer saw this situation that achilles was in also as a tragedy. And i think, especially in america, we do not understand the tragic mind set. We think that a tragedy is just something very sad that happens. But the greek idea of tragedy has much more than that. The greeks think there are just two fundamentally lable opposites in the world, and they both exist, and they are both true. That's why manis goes through all this suffering and pain.