The "final" version of my essay has some anonymous quotes from our
discussion (in the last section). I will remove the quotes if there are
objections. And I would be happy to list the names of authors, if they
ask for this in private messages.
Feel free to use this essay in any way you wish. But if you make some
changes then please replace my name by your name. Thanks to all who
helped to clarify things in the discussion. I will pay attention to
additional critical comments.
Ludwik Kowalski
Let the perfect not be the enemy of the good.