Thank you LinguisticMystic for your comment. I thought that I may be my project instead of writing about some well known things. Now, I know that I must focus on something, my ideas are too loose, I mean not tightly connected with something which would make sense. I will try to find a statement and examine it, as far as possible. If not, I have another topic to write, which is easier. But if I didn't ask you about it I would write about it and it may be a rubbish.