Some questions on the Cosmological Principle

[Pizza]

No, I just remember that the LCDM model ist the present favorite one. But please, do not ask me what exactly these letters are representing, even if read about it. I even discussed something in German already, but still have problems. You said it: look on the math. That is what I should do, you are right. And your explanations and answers were a good lesson for me today, not kidding, think I understood a little better already, without math. But math is the key, am convinced now.